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Table of Content

    15 January 2017, Volume 36 Issue 1
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    Effects of Different Content of Amorphous C12 A7/CaSO4 ·2H2 O System on Early Properties of OPC and Mechanical Performance
    ZHANG Jiang-tao;WANG Dong-min;WANG Yi-ren;LI Wen-ping
    2017, 36(1):  1-7. 
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    The effect of different content of amorphous C12 A7/CaSO4 · 2H2 O system on the early properties of setting time, fluidity and compressive strength of OPC was to investigate. Hydration products were tested by X-ray diffraction ( XRD ) and Scanning electron microscope ( SEM ) , and hydration process was analyzed by calorimetric method. The results show that C12 A7/CaSO4 ·2H2 O system used 5% of unit weight of cement, the mass ratio of C12 A7 and CaSO4 ·2H2 O was 1. 0 to 1. 0, the system accelerated the hydration of C3 S and C2 S, the hydration product C-S-H gel intertwined overlap to form the network structure which resulted the quick setting of cement paste, it also formed a large amount of acicular ettringite, the structure of hydration products was more and more compact, because of the ettringite filled with C-S-H gel each other, it improved the early strength of cement paste.
    Chloride Transport Model and Properties Analysis of Unsaturated Concrete
    FENG Chao;YU De-mei;GUAN Bo-wen;CHEN Hua-xin;SHEN Ai-qin
    2017, 36(1):  8-13. 
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    According to the chloride ion transmission mechanism, the chloride convection-diffusion control equation in unsaturated concrete was derived by considering the difference of moisture transmission the dry-wet alternate process. The results of model calculation have a good correlation with the measured results. The calculation results show that the free chloride ion concentration with increase with the increase of dry-wet cycles, the convection zone depth, surface chloride ion concentration and peak chlorine ion concentration increases with dry-wet cycles and gradually stabilized. The regression equations of each index were obtained.
    Chloride Profile with a Chloride Concentration Peak and Calculating Methods of Its Diffusion Parameters
    CHANG Hong-lei;MU Song;LIU Yu-jing;LIU Jian-zhong
    2017, 36(1):  14-19. 
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    A chloride concentration peak is prone to occur in the chlorideprofiles of concrete subjected to dying-wetting cycles. This research mainly investigated the influence of different water cement ratios ( W/C) on the occurring of chloride concentration peak. Besides, the appropriate calculating method of diffusion parameters was proposed for such chloride profiles with a concentration peak. The experimental results indicate that the peak value of chloride content (Cmax) presents a hysteric relation with increasing W/C, while the position where Cmax appears increased linearly with increasing W/C. Furthermore, the method of excluding the chloride content increasing part and starting from the position where Cmax appears to fit the chloride content phase is the proper way to obtain diffusion parameters of chloride profiles with a concentration peak. In addition, the method, excluding the increased content of chloride ions before the peak value and setting the exposure distance respective to the peak value as the zero point, was applied to obtain diffusion coefficient of chloride profile.
    Effect of Metakaolin on Compressive Strength and Capillary Water Sorptivity of Steam-cured Concrete
    XU Wen-wen;HE Zhi-min;LIU Jun-zhe;BA Ming-fang;WANG Jian-min
    2017, 36(1):  20-26. 
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    The compressive strength and capillary water absorption of steam-cured concrete with 30%replacement of cement by metakaolin and other mineral admixtures were investigated. The mechanism was also analysed using differential analysis( DTA) , thermogravimetric analysis ( TGA) and scanning electron microscope( SEM) . Results show that the presence of metakaolin( MK) is greatly beneficial in increasing the demoulding compressive strength of steam-cured concrete. The demoulding compressive strength of steam-cured concrete containing 10% fly ash( FA) and 20% MK is 23% higher than that of the blank concrete incorporating no MK, and 17% higher than that of the concrete incorporating FA and ground granulated blast furnace slag ( GGBS) . Use of FA, GGBS and MK as cementitious materials remarkably decrease the water sorptivity. For the steam-cured concrete containing MK, both the capillary sorptivity coefficient and the total mass of water absorption are the lowest. Thermal analysis and SEM images indicate that the main cuase for the improvement of demoulding compressive strength is the pozzolanic reaction between MK and Ca( OH) 2 liberated from cement at early ages due to thermal activation under 60 ℃ steam curing conditions. The consumption of Ca ( OH ) 2 and the formation of more hydration products are observed, thus the concrete become denser.
    Effect of Chlorine Salt Erosion on Multiple Interface Microstructure of Recycled Concrete
    LI Qiu-yi;WANG Zhong-xing;YUE Gong-bing;CAO Yu-bin
    2017, 36(1):  27-32. 
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    Through the study of recycled concrete by the chlorine salt erosion the micro-hardness of different interface changes, determine different recycled concrete strength grade and different interface transition zone, the chlorine salt erosion period the influence law of different interface microstructure of recycled concrete, reveals that the recycled concrete multiple interface degradation mechanism of the chlorine salt erosion. The study shows that: as the growth of the chlorine salt erosion age, with the strength of recycled concrete LG-XJ interface, LJ-XJ and LG-LJ interface of micro-hardness gradually reduce, transitional zone increased gradually. Erosion age of 30 d, C30 recycled concrete LJ-XJ interface transition zone range is almost have no change; Erosion age for 90 d, recycled concrete C60 LJ-XJ interface transition zone range change is not obvious. With the chlorine salt erosion resistance strength of recycled concrete interface strength relationships: LJ-XJ interface the chlorine salt erosion resistance >LG-LJ interface the chlorine salt erosion resistance>LG-XJ interface the chlorine salt erosion resistance performance. Different ages of the chlorine salt erosion of recycled concrete, with the improvement of strength grade, LG-XJ interface, LJ-XJ and LG-LJ interface of micro-hardness and transition zone and micro-hardness change of cement paste itself have different degree of reduction in amplitude.
    Influence of Gypsum and Silica Fume on Early Compressive Strength of Portland Cementing Material
    DING Xiang-qun;LIU Dan-yang;XU Xiao-wan
    2017, 36(1):  33-37. 
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    In order to study the influence of gypsum and silica fume on the early compressive strength of portland cementing material, we test the compressive strength of cement with different content of gypsum and silica fume at 4 h, 1 d and 28 d respectively. The microstructure characteristics of hydration products were analyzed by X-ray diffraction and scanning electron microscope. In a certain range, research shows that the compressive strength of cementing material increases with the content of gypsum increases, the compressive strength reaches peak when the content is 0 . 75%, and compressive strength reached 5 . 8 MPa and 63. 4 MPa at 4 h and 1 d. Silica fume increased from 0% to 15%, the compressive strength of cementing material increased by the content went up. The microstructure characteristics of the hardened cement paste shows that in, a certain range of gypsum to brought the amount of AFt in the system increased, the silica made the C-S-H get increased in the system,and unhydrated silica filled the pore of system.
    Effect of UHPC Hydration Heat on Early Age Shrinkage Cracking of Functionally Graded Composite Beams
    WANG Kai;ZHU En;LI Bai-dian;YANG Wei-de
    2017, 36(1):  38-42. 
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    The temperature field and the shrinkage performance of the UHPC-NC functional gradient composite beam was carried out, which was based on the UHPC thickness as the basic content in cement hydration stage. The results show that when the thickness of UHPC more than 20 mm, the difference in temperature between the center section and the outer edge reaches 5 . 6 ℃, and the difference of maximum tensile stress value caused by temperature is 3. 36 MPa, which proves that beam of hydration heat temperature stress produced can not be ignored. On the basis of experimental research, a calculation method considering the effect of the UHPC UHPC-NC functional gradient layer the thickness of the composite beam temperature stress was put forward. The calculation results are good agreement with real measured data.
    Preparation of Micro-size Food-grade Vaterite CaCO3 by CO2 Carbonization Method
    WANG Fen;YU Jun-xia;XIAO Chun-qiao;ZHANG Jin;YU Li-xia;ZHOU Fang;CHI Ru-an
    2017, 36(1):  43-50. 
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    Micron-size food-grade vaterite CaCO3 were prepared by CO2 carbonization method. The effects of temperature, Ca2+ concentration and CO2 proportion in gas mixture on the morphology and polymorph of the CaCO3 crystals and influences of ammonia amount and carbonization time on the yield of CaCO3 were investigated. The microstructures and morphology of the prepared samples were systematically investigated by FT-IR, XRD and SEM. The crystal of prepared CaCO3 changed from vaterite to calcite with increasing carbonization temperature and decreasing the proportion of CO2 in gas mixture. The particle size of CaCO3 increased with increasing the concentration of Ca2+. The yield of the prepared CaCO3 increased and then decreased with prolonging the carbonization time. The average size of the prepared CaCO3 particles was 3. 79 μm with uniform particle distribution and the yield was higher than 99% at the carbonization temperature of 20 ℃, Ca2+ concentration of 0. 3 mol/L, CO2 proportion in gas mixture of 30%, [ammonia]/2[Ca2+] of 1. 1, the carbonization time of 24 min. Heavy metal content was lower than the limits of national standard "Food additive GB1898-2007 light calcium carbonate additive".
    Damage of Concrete under Sulfate Attack Exposed to Different Types of Sulfate Solution
    JIANG Lei;NIU Di-tao
    2017, 36(1):  51-56. 
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    The degradation rule of concrete damage layer subjected to drying-wetting cycles in different types of sulfate solution was studied in the paper. Moreover, the mechanical properties of the damage layer was analyzed. Then the compressive strength of concrete in damage layer was obtained. The experimental results showed that the ultrasonic velocity in the damage layer decreased and the surface damage layer thickness of concrete increased with corrosion time, and the compressive strength in damage layer reduced obviously. When the damage layer thickness of concrete is thicker and the ultrasonic speed is lower, indicating that the deterioration degree of concrete increases. The concrete deterioration by magnesium sulfate covers the most aggressive corrosion, the damage layer thickness of concrete is the largest, and its compressive strength reduces obviously. The damage layer thickness of concrete in composite solution of Na2 SO4 and NaCl is the least, and the decrease of compressive strength is the lowest. The presence of chloride ions reduces the degradation degree of concrete under sulfate attack.
    Performance of Epoxy Emulsified Asphalt Cold Recycled Asphalt Mixture
    LI Quan;WU Chao-fan
    2017, 36(1):  57-63. 
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    A new type of cold recycled asphalt mixture-Waterborne Epoxy Resin modified emulsified asphalt cold recycled asphalt mixture was proposed and it is the first to use epoxy emulsified asphalt in cold recycled asphalt mixture. The mix design test and the performance verification of the AC-20 cold recycled asphalt mixture of 90% and 70% RAP( Reclaimed Asphalt Pavement) content were conducted by adding the epoxy resin of 0%,10%,20% and 30% modified asphalt emulsion. The results show that the epoxy resin of proper dosage modified emulsified asphalt cold recycled asphalt mixture can have better performance and RAP effective utilization can be further improved.
    Development on Performance of Early Age Concrete under Disturbance
    PAN Hui-min;ZHAO Qing-xin;FU Jun
    2017, 36(1):  64-70. 
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    Recent work on the experimental and theoretical research of concrete under disturbance in early age was reviewed. The engineering background of the disturbance problem of concrete in early age was summarized. Disturbance source and simulation experiment method were concluded and research progress of experimental methods for different disturbance sources was focused. Influence of disturbance and disturbance parameters on the performance of concrete was represented and the analysis of disturbance mechanism was combined. Some issues of the future development were pointed out and the development trend was suggested.
    Research Status of Silicon Nitride Ceramic Materials Sintered by Microwave Sintering
    XU Wei-wei;YUAN Jun-tang;YIN Zeng-bin;WANG Zhen-hua
    2017, 36(1):  71-76. 
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    Silicon nitride is a kind of ceramic materials with excellent properties and it is an ideal material in the use of high temperature structures and high speed cutting tools. In recent years, silicon nitride sintered by microwave sintering has been attracted by more and more attention with the development of microwave technology. In the paper, the research status of silicon nitride ceramic materials sintered by conventional and microwave sintering was introduced. Microstructure and mechanical properties of silicon nitride fabricated by various sintering technologies were compared. The advantages of silicon nitride sintered by microwave sintering were concluded. Finally, several problems of microwave sintering of silicon nitride needed solved in the further research were proposed.
    Application of Organic-Inorganic Pillared Montmorillonite in Industrial Wastewater Treatment
    ZHANG Du-juan;LU Jia-xuan;QIN Zong-hua;CHEN Ye
    2017, 36(1):  77-83. 
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    Due to its larger specific surface area, abundant pore structure and low cost, montmorillonite has been used in many fields, especially, industrial wastewater treatment. Therefore, based on the special structure of montmorillonite, the inorganic modification is proposed to improve its adsorption capacity by promoting its pore structure and surface area, compared with the traditional adsorbent. However, in order to further raise the adsorption capacity, it is an innovative idea that the organic modification was adopted to reduce its surface hydrophobicity and increase the addinity between the organic molecules. The structure, properties and the modification methods of montmorillonite are explained in this paper. In addition, inorganic-organic pillared of montmorillonite in industrial wastewater treatment are mainly summarized and the application prospects of inorganic-organic pillared of montmorillonite are discussed.
    Inhibition Mechanism of Amino Alcohol Corrosion Inhibitors
    WANG Xiao-tong;SUN Cong-tao;CHENG Huo-yan
    2017, 36(1):  84-88. 
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    Based on analyzing the inhibition behavior of amino alcohol corrosion inhibitors to concrete and steel rebar, the inhibition mechanism of amino alcohol corrosion inhibitors was put out, which on the one hand form a protective film on the steel rebar surface, isolating corrosive ions from the surface of steel rebar, on the other hand react with the hydration products in concrete to precipitate, improving the compactness of concrete. The two are complimentary, which play the role in delaying corrosion and reducing steel corrosion rate. Amino alcohol corrosion inhibitors has minimum inhibition effect in carbonated concrete environment, and still has effect in chloride environment, but when the chloride ion concentration or the corrosion rate is high in concrete, the effect of corrosion inhibitors are significantly reduced. Because the composition of corrosion inhibitors is complicated, its membrane mechanism still needs to be researched further.
    Effect of Mixing Procedures and Rheology on Fiber Distribution and Mechanical Property of Cementitious Composite (ECC)
    NIU Heng-mao;GUO Hai-qing;WU Wen-hong;LI Wen-jing;LI Ji-jun
    2017, 36(1):  89-96. 
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    Engineered cementitious composite ( ECC) is characterized by high ductility. The processing of fresh ECC plays a key role on fiber distribution and then influences robustness of high ductility of hardened ECC. The effects of fresh ECC mixing procedures and rheological property on fiber distribution were summarized, moreover, the effects of plastic viscosity and yield stress of fresh ECC on ECC fiber distribution and mechanical property were significantly studied. The results show that the fresh ECC mixing procedure with adding fibers finally is the optimal way;good plastic viscosity of fresh ECC leads to fiber uniform distribution, and yield stress is related to fiber distribution and fiber orientation distribution;Good fiber distribution is obtained by adjusting the rheological property, which results in acquiring robust high ductility of hardened ECC.
    Pozzolanic Reactivity and Applications of Tailings in Cement Admixture
    WANG Zhi-qiang;LYU Xian-jun;CHU Hui-chao;ZHANG Yan
    2017, 36(1):  97-103. 
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    As potential pozzolanic materials, the tailings used as cement admixture have attracted considerable attention in recent years. This paper briefly reviewed potential pozzolanic reactivity of tailings by activating and different types of tailings used in cement admixture, and analyzed the characteristics and the applications of different types of tailings, and pointed out that the tailings as cement admixture is an important way of comprehensive utilization of tailings.
    Research Progress on Key Technologies of Cementing Slurry for Long Sealing Section and Large Temperature Difference
    OU Hong-juan;LI Ming;MENG Fei;LIU Xiao-li;GUO Xiao-yang
    2017, 36(1):  104-109. 
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    In recent years, due to the exploration and development of oil and gas continue to develop in deep formation, the number of the cementing for long sealing section and large temperature difference also increases rapidly. It was pointed out that the shortage of cementing slurry for long sealing section and large temperature difference mainly lie in:(1) The use of retarder in different temperature range leading to ultra-retarding of cement slurry and the present research do not solve the problem in essence, the amount of retarder is large and has the poor salt resistance; ( 2 ) The sharp drop in viscosity of polymer additives at high temperature causing the stability deteriorates of cement slurry; ( 3 ) The difficulties in sealing annular space using low density cement; ( 4 ) The stability of cement slurry with high density is poor under the condition of high temperature and high pressure, based on summarizing the domestic and foreign research statuses. Considering these difficulties, the technical countermeasures of cementing slurry for long sealing section and large temperature difference were proposed, including: ( 1 ) The molecular structure of retarder is designed reasonable and the low temperature sensitive retarder researched has the advantage of strong salt-resistant and add a little;(2) Explore the essence of"bulge"phenomenon caused by AMPS copolymer; ( 3 ) Select and modify the closely packed model combined with the characteristics of well cementing engineering, to improve the application performance of high density and low density cement slurry; ( 4 ) Carry out the synthesis and production of high temperature suspension stabilizer.
    Research Progress on Activity of Metakaolin
    MO Zong-yun;MA Teng-fei;WANG Da-guang
    2017, 36(1):  110-115. 
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    Metakaolin as a pozzolanic activity material is an excellent substituted cement material since it cause less energy consumption and environment pollution during calcining and can improve some properties of Portland cement such as strength and durability when it is blended in cement. In recent years, many researchers devoted themselves to research the pozzolanic of metakaolin. In this paper, the optimum calcination temperature and time, the influence factors on the activity and the methods that test kaolin properties and metakaolin activity were summarized. According to the predecessors ' research results, the optimum calcination temperature and time are affectd by the mineralogy composition, crystallite and kaolinite content , among which the most prominent influence factor on the calcined kaolin 's activity is the crystallite. The kaolin's properties can be analyzed by the methods including XRD, TG-DTA and IR. The metakaolin 's properties can be analyzed by the Frattni, Chapelle, the electrical conductivity and the strength activity index test, among which the most accurate test methods are the Frattni and strength activity index test.
    Research Progress on Main Factors Affecting Synthesis of Copper Sulfide
    ZHANG Xiao-peng;WU Wen-wei
    2017, 36(1):  116-120. 
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    Because the nanostructure semiconductor metal sulfide has the unique physical and chemical properties, making it apply in photoelectric material. Therefore, according to the latest research progress at home and abroad, this paper has a detailed introduces of the factors affecting copper sulfide nanostructures, such as material, solvent, reaction temperature, reaction time. At the same time, we introduced band gap of the different morphology and the research progress of degradation of organic pollutants. Also we introduced the research progress of composite materials photocatalytic degradation of organic matter. Finally, in order to make some achievements on this field has certain help, the affecting factors of the band gap and application prospect of CuS were discussed.
    Research Progress on Surface Modification of Calcium Hydroxide Expansive Additive
    WANG Zi-long;DING Jian-tong;CAI Yue-bo;NING Feng-wei
    2017, 36(1):  121-125. 
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    Two aspects of physical mechanical modification and chemical coating modification are introduced. Research achievements of the methods such as specific surface area, different grain gradation, physical coating, chemical coating and carbonization of CO2 gas on the surface modification of calcium hydroxide expansive additive are detailedly summarized in this paper. The method and efficiency of surface modification of calcium hydroxide expansive additive are deeply analyzed. The main unsolved problems and the research directions are put forward.
    Rheological Properties of Series Clay-cement Grouting Material
    ZHANG Gui-jin;LIU Jie;KUANG Chu-feng;YANG Dong-sheng;FU Xiao-shu
    2017, 36(1):  126-133. 
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    The series of clay-cement materials are fine grouting materials with low price. They have been widely used in areas of landfill, curtain grouting, side slope treatment, cavity-filling and engineering for seepage-proof consolidation. Its rheological properties have an inconvenient influence on process and performance of the grouting engineering. The rheological model,viscosity time variation and thixotropy of this series of clay-cement materials are obtained by using Brookfield+R/S Rheometer. According to their rheological properties,the application range is analyzed. The results show that the rheological properties of clay cement slurry are related to the water-solid ratio and the amount of clay. The initial viscosity is larger than ordinary cement slurry. And the diffusion area is controllable. The clay cement slurry grouting material is widely used in the large space of porous formation. It can solve the problem of running slurry and grout leaking well and improve the efficiency of grouting. The rheological of clay cement paste slurry is mainly related to the amount of curing agent. Its initial yield stress and viscosity are large. And it has great resistance to water flow which can be used for blocking leakage and anti-seepage in the condition of underground dynamic water. The rheological of clay cement sand paste slurry is related to the amount of curing agent and sand-cement ratio. The initial yield stress and viscosity are larger and it’ s not easy to drain after adding sand into the slurry. The sand materials can be used as filler material in the cave, which can save the cost of the engineering. It is the preferred material for anti-seepage grouting with much soil in rock and cave.
    Effect of an Organic Protective Corrosion Inhibitor on Durability of Concrete
    GUO Xing-xing;TIAN Li;WANG Peng-gang;SONG Hua
    2017, 36(1):  134-138. 
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    The problem of insufficient durability of reinforced concrete has become more and more serious and the main reason is the corrosion of steel caused by chloride ion. Among the measures of improving the durability of concrete structure, the application of inhibitor has been expanded because of its advantages of simple construction, low cost and high efficiency. This paper presented a new type of organic protective inhibitor containing amino ketone molecule. In order to study the effect of this inhibitor on the durability of concrete,the concrete specimens added different quantity of inhibitor are used to carry out the compressive strength test, water absorption test, chloride penetration test and accelerated carbonation test. Then the mechanical property, water resistance, chlorine resistance and carbonation resistance of concrete are evaluated respectively. The results showed that the durability of concrete was improved in a certain extent due to the addition of inhibitor.
    Sericite Modified by Silane Coupling Agent Used for Reinforcing Styrene-butadiene Rubber
    LYU Hao;GUAN Jun-fang;CHENG Fei-fei;SHU Zai-qin
    2017, 36(1):  139-143. 
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    The base material is flaky sericite powder, which was modified with γ-Mercaptopropyltriethoxysilane. The modification effect was evaluated by the mechanical properties of composites. The result shows that the suitable surface modification conditions are modifier of 2%, modification temperature of 90 ℃,modification time of 20 min,and under this condition, the Sericite/SBR composites has excellent mechanical properties. FTIR analysis shows that the function way between silane coupling agent and the surface of sericite is chemical bonding, SEM observed that modified sericite evenly dispersed in rubber matrix, and forming excellent interaction with rubber. It proved that modified sericite could efficient enhance reinforcement effect of SBR.
    Using CFX to Simulate Decomposition Reaction of CaCO3 in Calciner
    LUO Qiao;YE Xu-chu;BAI Yang;LI De
    2017, 36(1):  144-148. 
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    Using CFX to simulate the flow, coal combustion and CaCO3 decomposition process of the calciner model, calculating mass balance and thermal balance calculation of gas components in the system, the results show that the relative error of O2 is less than 3%, CO2 is less than 9%, and the relative error of thermal is less than 9%, indicate that the reliability of using CFX to simulate calciner is more than 90%. When computational condition such as the amount of CaCO3 or pulverized coal is changed by 0. 01%, the temperature distribution of the furnace, the outlet temperature and the decomposition rate of CaCO3 is almost unchanged, while the variation is greater than 0. 01%, the results are seen to be changed. That is the sensitivity of simulation results calculated by CFX in response to these two calculation parameters can reach nearly 1/10000 .
    Properties of Sintered Heat Preservation Materials Prepared by Non-Anaerobic Digestion and Anaerobic Digestion Sludge
    XIAO Hui;LI Dong-hong;SONG Xin;QUAN Zong-gang;FU Guang-ming;TANG Bao-quan
    2017, 36(1):  149-155. 
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    Several kinds of sludge were used to prepare the thermal insulation wall materials, and the performances between non anaerobic digested sludge with anaerobic digested sludge in prepare the thermal insulation wall materials was compared. Firstly, the physical and chemical properties of raw materials were studied. The results show that Chongqing shale is suitable for the preparation of sintering block as raw material, and the optimum sintering temperature is 950 ℃. Sludge was characterized with high moisture content, high heat and high fever loss. Secondly, 1 # sludge and 4 # sludge were selected out to mix with shale, because of the best overall performance. The samples were sintered, and measured their molding moisture content, drying shrinkage rate, compressive strength ect. . The results show that the comprehensive performances of 4# sludge is higher than that of 1# sludge. When the non anaerobic digested sludge content is 15%, firing temperature is 950 ℃, the compressive strength grade of the samples reached MU7. 5, thermal conductivity were 0. 30001 W/(M·K), decreasing by 33. 33% than pure shale. When the anaerobic digested sludge content is 20%, firing temperature is 950 ℃, the compressive strength grade of the samples reached MU7. 5, thermal conductivity is 0. 2600 W/(M·K), decreasing by 42. 22% than pure shale. Analysis shows that, in the case of ensuring the strength to be the same, anaerobic digested sludge could effectively improve the content of sludge in making sludge bricks.
    Influence of La2 O3 on Structure and Properties of SiO2-Al2 O3-CaO-MgO Glasses
    HAN Jian-jun;YIN Peng;XIE Jun;WANG Jing;ZHOU Xue-dong;ZHAO Xiu-jian
    2017, 36(1):  156-160. 
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    The SiO2-Al2 O3-CaO-MgO glasses were prepared by high temperature melting method. The effects of La2 O3 content on the density, resistance to alkali, elastic modulus and the upper limit of crystallization temperature of SiO2-Al2 O3-CaO-MgO glasses were studied, and then the structure of glass was characterized by FT-IR Spectrometer. With the increasing of La2 O3 from 0 to 5wt%, the glass network changed, the density and molar volume of glass increased, while, alkali resistance of the glass decreased. The elastic modulus of glass increased from 90. 5 GPa to 93. 6 GPa when the La2 O3 content varied from 0 to 5wt%, then decreased. The La2 O3 content of the maximum elastic modulus value was 3 wt%. The upper limit of crystallization temperature decreased from 1224 ℃ to 1209 ℃, then increased to be a constant at 1212 ℃. The La2 O3 content was 2wt% when the temperature was lowest.
    Air-Entraining Concrete Strength and Permeability Effect Rule Research under Different Curing Conditions and Age
    ZHANG Rui-wen;WANG Qi-cai;ZHANG Rong-ling;DAI Jin-peng;ZHANG Kai;WANG Bing-zhong
    2017, 36(1):  161-167. 
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    This experiment mainly studies the rule about strength of air-entrained concrete in different age of 7 d、14 d 、28 d、56 d、84 d and 112 d and permeability of 28 d、56 d、84 d and 112 d under different curing conditions. By comparing the compressive strength and the permeability of the air- entrained concrete under the standard curing condition, the strength loss rate and the growth rate of the air-entrained concrete under ther different curing conditions were obtained. Test the age of air entraining concrete strength loss rate, minus temperature and low temperature was 22. 40%-41. 00%,7. 97%-18. 26%. Permeability growth rate range under minus temperature is about 76 . 52%-114 . 35%,12 . 34%-47 . 86% in the low temperature. At the same time ,by the air-entraining concrete permeability and strength experimental data regression analysis, linear correlation coefficient under different curing conditions are obtained. Data show that linear correlation coefficient under the conditions of minus temperature ( -3℃) is less than linear correlation coefficient under the conditions of low temperature ( 3 ℃) , which shows that temperature has an effect on linear correlation of concrete permeability and strength . According to the dialectical relationship between permeability and strength, it can provide theoretical support and reference for the design of concrete mix proportion of waterproof engineering in winter construction.
    Mechanical Property of Rubber Concrete Modified by MAH with Different Initiating Agents
    ZHAO Yan-liang;LIU Fei;TAN Jun-hua;ZHU Kai-jin;LIANG Yu-rong
    2017, 36(1):  168-172. 
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    Properties of slump, compressive strength, dynamic modulus of elasticity, etc, of rubber concrete with waste rubber powder modified by MAH with different initiating agents, and analysis of the interface bonding with SEM. The results show that DCP, BPO as initiators were grafted on the rubber surface, but the effect of DCP was obvious, and the grafting rate was the highest. 28 d compressive strength of modified rubber concrete was better than the other two kinds of initiators. Maximum strength was 45 . 1 MPa when the best radio was 15%. There were a lot of needle and flake cement hydrates embedded in the rubber around modified rubber concrete interface when DCP as initiator, tied the two phase interfaces, the best effect.
    Comprehensive Decision Model of Carbonate-type Manganese's Processing Based on AHP
    ZHAO Min-jie;FANG Jian-jun;ZHANG Lin;WANG Shan;DAI Zong;YAO Zhang-wei
    2017, 36(1):  173-179. 
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    Analytic Hierarchy Process( AHP) was used widely in decision analysis. This paper aimed to demonstrate it's validity of decision-making and evaluation in ore dressing, further, it's feasibility in the decision-making of process was discussed. Low grade carbonate-type manganese ' s processing from Guangxi was used as sample. The evaluation, based on the original data,compared five different schemes of ore dressing, and evaluated three aspects ( concentration grade, recovery and yield) , on the basis of AHP, through generalized evaluation method, subsequently, weight parameters were given by experts, then the factors' weights were analyzed. The result of single ordering and total ordering are satisfactory in consistency. The index of concentration grade was considered firstly, combined magnetic separation and reverse-flotation method was the best process of ore dressing. The results were matched well with the original results. Therefore, the AHP could effectively evaluate the decision-making of process in dressing plant.
    Influence of Glass Powder Particle Size on Properties of Complex Binder
    FAN Lei;LIU Guang-yan;LU Rui-yang;JIN Da-zhi
    2017, 36(1):  180-185. 
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    Glass powder with different particle size distributions were tested by laser particle analysis. Influence of the particle size distribution of glass powder on properties of complex binder were investigated by using GIA and SEM. The result show that the particles ranging?10 μm has the positive effect on the strength development of complex binder, the particles ranging from 5 to 10 μm has the maximum positive degree of grey incidence. Those with size lager than 45 μm correlated with the properties of complex binder negatively, contributed less to the strength development of complex binder. Glass powder can be more dispersed to porosity of complex binder when glass powder were prepared by physical milling ( 35 min) , the structure of complex binder is more dense, and the compressive strength of complex binder is improved.
    Process and Properties of Boron Nitride Synthesis
    ZHOU Ying-ying;SUN Run-jun;ZHANG Zhao-huan;SHENG Cui-hong;ZHOU-dan
    2017, 36(1):  186-190. 
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    In this paper, boron nitride precursor polymer was synthesized by a certain ratio of boric acid and melamine,The boron nitride precursor polymer was dissolved in formic acid solution, and the boron nitride precursor was spinned in 23 kV,15 cm of the distance. And the fiber was uniform. The synthesis of precursor polymer was placed in a muffle furnace and then was heated to 800 ℃ according to 10 ℃/min of heating rate, and was held for a certain time, boron nitride product was made. Its colour is white and hardness is larger. The performance characteristics of the product were tested by using the Fourier transform infrared spectrometer, TG-DSC thermogravimetric analyzer and scanning electron microscope.
    Influence of Mineral Admixtures and Recycled Aggregate on Strength and Shrinkage of Cement
    ZHENG Xiao-qing;ZHOU Ze-you
    2017, 36(1):  191-196. 
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    Making mineral admixtures and recycled aggregate into cement products is an important way for wastes recycling. In order to research the influence of mineral admixtures and recycled aggregate on the strength and shrinkage of cement, different replacement rates of mineral admixtures and recycled aggregate were designed, followed by strength, drying shrinkage and autogenous shrinkage experiments in varied ages. The results show that fly ash reduces the strength, while mineral powder increases the post strength. Fly ash and mineral powder reduce the drying shrinkage, while increase the autogenous shrinkage of cement. Recycled aggregate improves the strength, but has little influence on the shrinkage of cement.
    Adsorption of Semi-coking Wastewater on Activated Carbon Loaded Cerium and Manganese
    GAO Wen-wen;GONG Ying;GAO Yan-ning;CHEN Bi;JIANG Xu
    2017, 36(1):  197-204. 
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    Semi-coking wastewater was treated by self-made Ce-Mn/AC. The effects of pH and dosage of Ce-Mn/AC on COD removal rate of semi-coking waste water were studied by static examination of equilibrium adsorption. The adsorption properties of semi-coking wastewater on Ce-Mn/AC was investigated by using adsorption kinetics model, adsorption isotherm and adsorption thermodynamics model to fit the adsorption process, and the probable adsorption mechanism was induced by GC-MS and UV-vis analysis. The results show that the semi-coking wastewater adsorption capacity on Ce-Mn/AC was 82. 9 mg·g-1, and the COD removal rate was 84. 6% when under the Ce-Mn/AC dosage was 10 g· L-1 without adjusting the pH value of semi-coking wastewater. The adsorption kinetics fitted pseudo-second-order model, Freundlich model could better describe adsorption of semi-coking waste water by Ce-Mn/AC,△G<0,△H>0 and △S>0 indicated that the adsorption was spontaneous, endothermic and mainly by chemisorption process. Refractory organic compounds such as polycyclic aromatic hydrocarbons and nitrogen heterocyclic compounds were adsorbed before monocyclic aromatic compounds, so the effect of refractory organic compounds on the following semi-coking wastewater-treatment system was greatly induced and some data and theory foundation were provided. Adsorption and desorption experiments indicated that the adsorbent had a better property for repeated use.
    Preparation of Modified Zeolites and Their Adsorption Characteristics of Chromium
    HUANG Yu-mei
    2017, 36(1):  205-209. 
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    In order to solve the low adsorption capacity of natural zeolites to heavy metals in wastewater, six kinds of modified zeolites were prepared and the adsorption properties of modified zeolites to hexavalent chromium ions were investigated. Among the six modified zeolites, H2 SO4/CuSO4 composite modified zeolite has the best adsorption performance to chromium. The adsorption curve of chromium is in accordance with Freundlich equation. Its adsorption intensity is 8 times that of natural zeolite. The adsorption kinetic curve accord with the second-order kinetics model. The results show that ion exchange plays an important role in the adsorption of hexavalent chrome ion, which is very close to the theoretical value.
    Synthesis and Property of Phosphorus-containing Borate as Lubricant Additive
    GONG Dian-ting;LI Feng-hua;ZHANG Hong-jun
    2017, 36(1):  210-213. 
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    Phosphorus-containing borate as lubricating oil additive preparation was disscussed which had high hydrolytic stability and good abrasion resistance by boric acid and lauryl alcohol and phosphorus pentoxide, and the esterification method was adopted, ethanol was choosed as dehydrant. The optimum reaction conditions were the molar ratio of cetyl alcohol and boric acid and phosphorus pentoxide as 7∶2∶1,reaction temperature was 105-110 ℃, and dehydration 4 h. The anti-wear properties of the base oil containing the additive were tested with four-ball apparatus. The results showed that phosphorous borate additives could remarkably improve the antiwear properties of the base oil and additives existde an optimum value. The phosphorus-cotaining borate as lubricant additive were used in tank workshop of the New Northeast Electric Group, as a result, the lubrication effect and the anti-wear performance were very appropriate.
    Absorption Characteristics and Influencing Factors of Montmorillonite to Polycarboxylate Superplasticizer
    CHEN Chang-liang;GUO Li-ping;DU Xiao-di;ZHENG Xiao-qi;LEI Jia-heng
    2017, 36(1):  214-218. 
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    The absorption equilibrium of polycarboxylate-type superplasticizer ( PCE ) on montmorillonite ( MMT ) and its influencing factors were investigated by the gel permeation chromatography ( GPC ) method. The results show that montmorillonite had strong adsorption for PCE and its adsorption amount increased with concentration. The adsorption amount was 7. 03 mg·g-1 as the concentration of PCE was 2. 00 g·L-1(PCE standard dosage in the concrete),While the concentration of PCE was double of the above, the adsorption amount was 14. 61 mg · g-1;The maximum adsorption capacity of PCE on montmorillonite (saturated adsorption amount) was about 21. 18 mg·g-1. The change of the pH value has little impact on adsorption quantity when the concentration of PCE was lower than 2. 50 g·L-1 . But the presence of Ca2+, Mg2+metal ions could increase the adsorptionamount of PCE among which Mg2+ion was particularly evident. Further studies had shown that adsorption of PCE on montmorillonite was an endothermic process and adsorption process conforms to the secondary dynamics equation. The adsorption could reach equilibriumjust in 5-10 min.
    Physical Forming and Structure of Spherical Diatomite
    LYU Xiao-xuan;WANG Hui-min;WANG Li
    2017, 36(1):  219-222. 
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    Taking diatomite as the main material, adjoining sintering additive and binder, spherical diatomite material was obtained by using physical forming and low-temperature roasting. The material was characterized by scanning electron microscope, X-ray diffraction. The results indicate that in the process of materials preparation, the crystal transition had not occurred. The specific surface area of materials increases at first then decreases with the increase of calcination temperature. The excellent pore structure of spherical diatomite materials was gained when calcination temperature at 400℃ for 120 min. The high specific surface area, total pore volume and narrow pore-size distribution were 54. 753 m2/g, 0. 1426 cm3/g and 3 nm, respectively.
    Effect of Reinforcing Agent Composition on Performance of Permeable Concrete
    HANG Mei-yan;LI Zhen;HAO Xiao-long
    2017, 36(1):  223-228. 
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    The reinforcing agent is used for improving compressive strength, flextural strength and penetration of permeable concrete. The effects of water reducing composition, early strength compositiont and viscosity modifying compositon on the performance of permeable concrete were studied. The compressive strength, flexural strength, and the permeability coefficient and the water permeability of the permeable concrete were measured by changing types and content of the various components in the reinforcing agent. The experimental results show that the preformence of concrete with the reinforced agent by 0. 3% of polycarboxylic superplasticizer, 1. 0% of early strength increasing agent and 0. 1%viscosity is more better.
    Preparation of AgNO3/MCM-41/NiFe2 O4 and Its Application in Olefin Adsorption
    MI Qin;LI Yu;WANG Ke-jie;FAN Li-hong
    2017, 36(1):  229-234. 
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    AgNO3/MCM-41/NiFe2 O4 was designed and synthesized via the incipient wetness impregnation. It served as a magnetic complex separation adsorbent and could be used to separate the long-chain olefin/paraffin mixtures. The samples were characterized by powder X-ray diffraction analysis ( XRD ) , nitrogen adsorption-desorption analysis, Fourier transform infrared spectroscopy ( FTIR ) , vibrating sample magnetometer ( VSM) and etc. The tests show that the obtained products are composed of NiFe2 O4 with spinel structure and MCM-41 with hexagonal arrangement of unidimensional mesopores. AgNO3 is dispersed in a monolayer in the channel. The optimal loading amounts of AgNO3 is 0. 2 g/g magnetic carrier. The specific surface area and most probable pore size are 717. 89 m2/g, 2. 94 nm. For the C11 olefin/C11 paraffin mixtures, adsorption behaviours of C11 olefin on magnetic adsorbent were investigated. Results show that adsorbents have preferential adsorption for long-chain olefins. The one-stage equilibrium adsorption capacity and adsorption time are 2. 14 g/g, 100 min respectively. Adsorptive selectivity and magnetic recovery of adsorbents after reuse were studied. After repeated use ten times, the recovery was up to 98. 9% and the selectivity of olefin decreased slightly. But the changes still can satisfied requirements for olefin adsorbed selectively.
    Lightweight Aggregate Concrete with TB-C and Mechanical Property of Steel Bar
    LI Hu-yong;WANG Li
    2017, 36(1):  235-241. 
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    In order to analysis the mechanical and the bond properties of the concrete, which added steel light aggregate. The mechanical and the bond performance between steel bar and HPP fiber reinforced lightweight aggregate concrete were analyzed based on the experience. The results show that the enhancement effect difference is bigger under the different water consumption, sand coarse aggregate ratio. The ultimate bond performance increasing with the concrete strength grade,and it could be reduced the initial slip of steel bar. Added steel fibers of mechanical and adhesive properties of concrete specimens will be reduced as a lightweight aggregate cylinder pressure is reduced.
    Preparation of Magnetic Halloysite Composite and Its Adsorption Performance for Methylene Blue
    MA Wen-qing;HE Wen-fang;WANG Yun-sheng;ZHANG Wei;CHEN Yuan-tao
    2017, 36(1):  242-248. 
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    Magnetic halloysite composite was synthesized by chemical co-precipitation method. The adsorption performance for magnetic halloysite composite was synthesized by static experimental method. The adsorption performance for methylene blue was investigated by static experimental method. The adsorbent was characterized by Fourier transfer infrared ( FT-IR ) , Transmission Electron Microscope ( TEM) , X-Ray Diffractome ( XRD ) and vibrating sample magnetometer ( VSM ) . Batch adsorption experiments were conducted to study the influence of various factors, such as HNTs/FeCl3 ·6H2 O mass ratio, adsorbent dose, initial concentration of methylene blue, initial pH, contact time on the adsorption of methylene blue. At the same time, the adsorption kinetics was investigated. The results indicate that magnetic halloysite composite is successfully obtained. The adsorption of magnetic halloysite for methylene blue is strongly affected by initial pH. The adsorption behavior is fitted well to the pseudo-second-order kinetic model.
    Analysis on Strength Characteristics of Super-fine Unclassified Tailiings Cemented Backfills
    YANG Lei;QIU Jing-ping;FAN Kai;LI Hao;HU Shi-qiang
    2017, 36(1):  249-256. 
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    Cemented-tailing backfills were produced by taking unclassified tailings of Zhongguan Iron Mine as filling aggregate, and ordinary Portland cement as cementing agent. Physicochemical properties of unclassified tailings were analyzed, quantitative relationships between backfill strength and cement-tailing ratio, slurry concentration, and curing age were discussed by using single-factor four-level experiment, and sensitivity of backfill strength to these factors were also studied. The results show that, unclassified tailings of test, whose median diameter, alkalinity coefficient and activity coefficient are 14. 2 μm, 2. 31 and 2. 12 respectively, belongs to alkaline super-fine tailings with high activity. Strength of full tailings cemented backfill follows exponential function with cemented-tailing ratio and slurry concentration, but linear function with curing age, and the the corresponding correlation coefficients are 0. 97, 0. 96 and 0. 92 respectively. Sensitivity of backfill strength to curing age is the maximum, followed by cement-tailing ratio, and slurry concentration is the minimum.
    Preparation of Vermiculite-like Layered Silicate by Hydrothermal Method
    LIU Yi;WANG Jun-hua;HAO Bin;YAN Shi-you;CHEN Zhao-yang
    2017, 36(1):  257-261. 
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    Vermiculite-like layered silicate has been synthesized by hydrothermal method, the effects of reaction temperature, reaction time and silicon source on the structure and morphology have been investigated. The reaction temperature has an important influence on the structure of materials; the degree of crystallinity has been significantly improved as the reaction temperature increases. When temperature is increased to 340 ℃, there are stratification and impurities of Sodium Aluminium Silicate Hydrate in samples. The degree of crystallinity improves and the size of lamina increases with increasing the reaction time. When the reaction time is increased to 36 h, the impurities are observed in the samples. The influences of silicon resource on the structure are much less than the crystallinity. The results show that the optimum temperature is 300 ℃, the optimum reaction time is 24 h, and the optimum silicon source is fumed silicon dioxide.
    Snowmelt Performance of Ultra-thin Saline and Self-melted Asphalt Mixture
    LIU Zi-ming;CHEN Hua-xin;DOU Huai-bing;WANG Yong-dan;NIU Dong-yu
    2017, 36(1):  262-268. 
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    In order to investigate on the snowmelt performance of ultra-thin saline and self-melted asphalt mixture,the solution conductivity as evaluation index to represent salt concentration in the solution size, since the snowmelt asphalt mixture indirect evaluation effect of snow melting of the ice. Grey entropy method was used to analyze the effect of different factors on the properties of snow melt significantly,and its snowmelt mechanism was discussed. The results show that the greater the amount of saline content alternative,the better the performance of melting snow. As the extension of dissolving analysis time,air void of asphalt mixture performance of snowmelt influence degree decreases. With the increase of water added,asphalt mixture snowmelt performance attenuation gradually. Saline content replacement is the main factors influencing the performances of asphalt mixture of snowmelt. The research results for the ultra-thin saline and self-melted asphalt mixture composition design provides a useful reference.
    Time-Dependent Behavior of Rheology for Cement-Ground Limestone Paste
    XIAO Jia;WANG Da-fu;GUO Ming-lei;SHEN Chuang;YIN Zhe-wei
    2017, 36(1):  269-275. 
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    The variation of rheological parameters with hydration time for the cement-ground limestone paste was studied and the rheology of cement-ground limestone paste was measured through the rotational viscometer of RHEORIAB QC type, the related rheological parameters was obtained by fitting paste rheological curve based on Herschel-Bulkley model. Dynamic yield stress and consistence of cement-ground limestone paste were fitted respectively by models proposed by Roussel and Philippe. The results show that the dynamic yield stress of cement paste is smaller than ground limestone paste, while the consistency is larger. The dynamic yield stress and consistency of cement-ground limestone paste linearly increase with hydration time; the increasing rate of the dynamic yield stress and consistency linearly decrease with the increasing mixing amount of ground limestone, and the initial dynamic yield stress linearly increase, while the consistency increases at first then decreases and presents a quadratic parabolic law.
    Effect of Reactive MgO on Chloride Ion Binding Ability of Cement-Based Materials with High Addition of SCMs
    CHEN You-zhi;WANG Yi-fei;SUN Tao;HAN Wei-wei;YIN Wei-song
    2017, 36(1):  276-281. 
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    The effect of active MgO on the chloride ion binding ability of cement-based materials with high SCMs addition, and the test was taken by the measure of reactive MgO and CaO mixing. The total and free chloride contents of pastes were tested by automatic potentiometric titrator, and the phase composition of pastes were analyzed by means of XRD, DTG. The experimental results shows that in the case of reactive MgO and CaO mixed content 10%, the early compressive strength of the paste decreased with the increase of reactive MgO content, while the later growth rate of compressive strength increased. With the addition of 5% reactive MgO, the binding of chloride ion content reached the maximum. XRD, DTG and other analysis showed there are C-S-H gel, hydrotalcite and Friede salt in the paste.
    Experimental Research on Influence of Concrete Early Carbonation Depth by Admixture
    ZHANG Cheng-zhong;SUN Guang-shuai;HU Xiao-peng;ZHANG Yong-li
    2017, 36(1):  282-287. 
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    Through the carbonation test of admixture concrete under natural exposure condition, the influence laws of fly ash content, slag content, coal gangue content on the carbonation depth of concrete were analyzed, and the interaction of double-mixed admixtures on the concrete carbonation depth was also discussed. On basis of experimental data, an expression of the influence coefficient of mineral admixture on carbonation speed was established. The results show that the carbonation depth of concrete decreases slightly when the content of single mixing fly ash is less than 15%, and concrete carbonation depth increases with the increase of fly ash content after its content is more than 15%. The carbonation depth of slag powder concrete increases with the increase of slag content. The anti-carbonation performance of concrete increases when the content of single mixing coal gangue is less than 20%, while mixed with more than 30% of coal gangue, the concrete carbonation depth increases significantly. Along with the increase of fly ash content, the carbonation depth of both concrete mixed with fly ash and slag powder and concrete mixed with fly ash and coal gangue increases, concrete carbonation depth changes smaller after in the fly ash concrete adding 25% slag or 20% coal gangue. In the coal gangue concrete adding 25%-40% slag powder, the concrete carbonation depth has no obvious change, while the carbonation depth increases obviously when it mixed with more than 40% of slag powder. In the slag powder concrete adding 20% coal gangue, the concrete carbonation depth will increase by about 40%.
    Effect of Ion Exchange Process on ESP Glass
    HE Feng;MA Qiang;SONG Pei-yu;HU Lan;YE Shi-qian;XIE Jun-lin
    2017, 36(1):  288-295. 
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    Two step ion-exchanged method for preparing engineered stress profile glass ( ESP glass ) is used in this paper. The first step ion-exchanged time is longer than the second step ion-exchanged time in the two step ion-exchanged method. The difference in the performance of ESP glass after different first step ion-exchanged process is studied. In this paper, the ESP glass is tested by the bending strength test, micro hardness test, EPMA test. Weibull modulus could be calculated by the bending strength, and the ion diffusion coefficient could be calculated by the K ion distribution. The results show:the second step ion-exchanged could reduce the bending strength of the first step ion-exchanged glass. But after the two step ion-exchanged process, ESP glass has a higher Weibull modulus. The trend of micro hardness is consistent with the trend of bending strength. Combined with the bending strength and K ion distribution, the best temperature of the first step ion-exchanged is 450℃, and the time is 30 h. The second step ion-exchanged temperature is 400 ℃, and the time is 33 min.
    Melting Characteristics of Complex of Different Types of Industrial Solid Waste at High Temperature
    WANG Hao;MA Zhi-bin;LIAO Hong-qiang;CHENG Fang-qin
    2017, 36(1):  296-300. 
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    Five samples of industrial solid waste were formulated by the different acidity coefficient. The characteristic temperature was tested by ash fusion point determination meter, and the high-temperature viscosity was detected by high-temperature viscosity tester. The result show that the melting temperature increases with the increase of the acidity coefficient during the range of acidity coefficient of 0 . 95-1 . 19 , especially for the sample with higher acidity coefficient. The viscosity of the high-temperature melt always increase with the temperature decreases, when the viscosity increased from 0 mPa·s to 1000 mPa·s, the rate of the viscosity changed with temperature, which seems relate to the content of Fe2 O3 in the test sample, but lack of correlation with the acidity coefficient. As a whole, the rate of the viscosity changed with temperature decrease with the content of Fe2 O3 increases.
    Structure Reconstruction of Calcined Layered Double Hydroxides in Cement Materials and Its Carbonation Analysis
    CHEN Ai-jiu;YUN Yu;MA Jun-tao;LI Chao;YAO Wan-wu
    2017, 36(1):  301-305. 
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    A new method for absorbing carbon dioxide invading cement and enhancing carbonation resistance of cement material is proposed based on the anion exchange capacity and structural reconstruction capacity of layered double hydroxides ( LDHs ) . X-ray diffraction was used as the main means to characterize structure changes and the ability of carbonation resistance performance in cement materials contained LDHs. The results shows that: LDHs calcined at 500 ℃ has a strong ability to structure reconstruct, and it can absorb carbon dioxide in cement hydration environment and effectively improve the ability of carbonation resistance capacity of cement materials.
    Preparation and Luminescence Properties of Tb3+ Doped Transparent Glass Ceramics Containing CaMoO4 Nanocrystals
    LI Ming-yue;ZHANG Hong-bo;TIAN Ying-ya;SHAO Jing;SU Chun-hui
    2017, 36(1):  306-310. 
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    Tb3+ doped transparent molybdate glass ceramics containing CaMoO4 were successful fabricated by melt-quenching technique. The optimal heat-treated system for the glass sample was determined by DSC,XRD and SEM(715℃ for 2. 5 h). The grain size of the glass ceramics gradually increased with the increasing of heat treatment time. The UV-Vis-NIR spectra indicated that the sample transparency was approximately up to 80% in visible light range. The effect of different Tb3+ doping concentration on the luminescence properties of the glass ceramics under the condition of the same heat treatment by fluorescence spectrum. The experimental result indicated that the Tb3+ doping concentration was 7. 0 mol%, the sample has the maximum fluorescence intensity.
    Experimental Study on Mechanical and Shrinkage Properties of Recycled Aggregate Concrete
    HOU Yong-li;LI Chen-xia;HUO Jun-fang;LYU Xiao-yan
    2017, 36(1):  311-314. 
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    Mechanical property and shrinkage performance of recycled concrete compared with the natural concrete, which were made by conventional aggregate replacement method and equivalent volume mortar method. The results show that the change rule of the compressive strength of recycled concrete cube is basically the same as the ordinary concrete. The strength of different age of recycled concrete prepared by the conventional aggregate replacement method is lower than that of the other kinds of concrete. In the later period, the cubic compressive strength of recycled concrete made with the equivalent volume mortar method is increased obviously;the shrinkage of recycled concrete is increased along with the age of concrete. The 280 d shrinkage rate of recycled concrete prepared by the conventional aggregate replacement method is increased by 4 . 7%, while the shrinkage rate of recycled concrete prepared by equivalent volume mortar method is 10. 2% lower than that of ordinary concrete in 280 d.
    Effects of Temperature and Surface Metal Plating on Vacuum Brazing between Aluminum Alloy Matrix Composites and Kovar Alloy
    GAO Zeng;XIA Ren-ling;QIN Shao-lei;MI Guo-fa;NIU Ji-tai
    2017, 36(1):  315-320. 
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    Using Al63-Cu22-Ti5-Si10 as brazing alloy, vacuum brazing between 55% vol. SiC particle reinforced aluminium matrix composites (55% SiCp/Al MMCs) and kovar alloy was investigated. The effects of brazing temperature and different plating material on the surface of SiCp/Al MMCs on joint shear strength and joint microhardness was analyzed, respectively. The microstructure characteristic of joint was studied as well. The results indicate that brazing temperature and plating material have significant influence on the joint mechanical property. With the same brazing processing parameters, the shear strength of specimen SiCp/Al MMCs covered by copper is much higher than those of covered by nickel and non-cover. The maximum shear strength can reach 92. 8 MPa. With the increasing of brazing temperature from 560 ℃ to 580 ℃, the shear strength decreases gradually and then increases. For the specimens with different plating material, the maximum shear strength of joint can be achieved at the brazing temperature 560 ℃. With the same brazing temperature, specimen covered by copper has the maximum microhardness and the specimen covered by nickel has the minimum microhardness. The microstructure of joint is quite dense and free from defects such as void and non-wetting area. After brazing, the plating metal has disappeared and it was replaced by brazing alloy. By using brazing filler alloy Al63-Cu22-Ti5-Si10 , the reasonable brazing temperature is 560 ℃ and the reasonable plating material is copper on the surface of composite under the parameters of vacuum degree 6 . 5 × 10 -3 Pa and soaking time 30 min.
    Preparation of High-performance HPW-based Catalyst for Dibenzothiophene Oxidation
    WANG Hong-ju;ZHAO Ji-xiang;LIU Na;ZHAI Shang-ru
    2017, 36(1):  321-324. 
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    A layer-by-layer stabilization strategy was employed to immobilize active tungstophosphoric acid onto pentaethylenehexamine-preloaded ZrSBA-15. The synthesized materials were characterized by XRD, N2 adsorption-desorpton isotherms, FT-IR and TEM, etc. Utilizing hydrogen peroxide as oxidant, the composite exhibited favorable performance toward the deep oxidation desulfurization of dibenzothiophene;and it could be reused at least six runs without discernible decrease in activity.
    Geo-stress Measurement by Hydraulic Fracturing Method and 3-D FE Regression Analysis of Multivariate Geo-stress Field of Tianchiping Tunnel
    YU Yun-yan;LI Guo-liang;CHEN Zhi-min;ZHAO De-an;YIN Jian-min;LI Yong-song
    2017, 36(1):  325-332. 
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    Tianchiping tunnel is a very long single track tunnel from Lanzhou to Guangyuan of Lanyu railway, which is located at Tanchang couty of Gansu province. The total length of the tunnel is 14. 528 km. In the exploration area, a total of 26 hydrofracturing tests in 4 vertical exploration boreholes drilled from the ground surface are carried out. The results suggest that the present stress field of Tianchiping tunnel is dominated by horizontal stress, and the maximum horizontal stress is dominantly oriented NNW-NW-NWW. Stress magnitude is extreme high stress level. At the same time, the maximum horizontal stress orientations are closely consistent with those in the general contemporary stress field in southeast of Gansu Province. The maximum horizontal stress orientations in measurement hole No. LY1 is N40° W-N45°W. The angle is large between the maximum horizontal stress orientations and those along tunnel axis, which is a great disadvantage to the tunnel stability. Based on the geological conditions and rock mass properties, a 3D mechanical model is established, and the regional geo-stress field of tunnel area is analyzed by 3D multivariate FE regression from limited stress data of in-situ geo-stress measurement. The results of macro geo-stress field indicate that the transverse stress values are lager than 10 MPa along the tunnel axis,the lateral pressure coefficients is between 1 and 2,and stress concentration due to topography and other factors on local areas results to a great large lateral pressure coefficients. The results of macro geo-stress field are very important for dynamic design and construction.
    Analysis of Low-Frequency Sound Insulation Characteristics for a Circular Membrane-ring Structure of Locally Resonant
    ZHANG Jia-long;YAO Hong;DU Jun;SUN Yue;SUN Yan-ran;TAN Jing;ZHANG Xiu-yu
    2017, 36(1):  333-339. 
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    Aiming at the nonlinear PIO problem caused by Aero-engine noise during ultra-low-altitude airdrop process, a circular membrane-ring structure mode local resonance mechanism resonators was applied to reduce noise and vibration. The analysis of band gap formation mechanisms , the width of band gap affect factors, and sound insulation quantities by theoretical analysis and simulation test. The simulation test results show that the locally resonant band gap is the consequence of the local resonances and the traveling wave modes interactions. The coupling strength affect bandwidth and sound insulation effect directly,which depends on thin membrane size and surface density, so the greater the radius of inner and the surface density, the wider band-gap, the higher the resonant frequency; sound Insulation depends on the thin membrane surface density,the circular surface density and the position of center ring. This research result that the structure has a good sound insulation of characteristics by optimizing structure parameters, which suppress vibration and improve flying qualities of transport effectively.
    Effect of Graphite on Performance of Metal Diamond Abrasives
    YANG Yu-he;YIN Yu-hang;ZHOU Hao-jun;FANG Jia-bin
    2017, 36(1):  340-344. 
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    The effects of the different graphite type, particle size and content on the performance of metal diamond abrasives were studied using the method of orthogonal experiment, measuring the abrasive ratio and mechanical property. The experimental results show that the abrasive ratio of metal diamond abrasives reaches 206 . 62 , the mechanical property is fine and the sharpness is high when the adding mass fraction of flaky graphite is 3wt%,and particle size of flaky graphite is 80 mesh. So the comprehensive properties of metal diamond abrasives are high, which would make certain significance for practical application.
    Preparation and Characterization of Na/Mg/F Co-doped Hydroxyapatite in Simulated Body Fluids
    GUO Xiao-jun;LI Dai
    2017, 36(1):  345-351. 
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    Na/Mg/F three elements co-doping hydroxyapatite ( HA) powders were prepared by chemical precipitation method in simulated body fluids environment. The phase, structure, micromorphology, chemical composition and thermal stability of the obtained powders were analyzed and characterized by XRD, FT-IR, SEM and EDS. The results show that Na/Mg/F co-doping cause the lattice distortions of HA and the doping amount of F element has some influences on the morphology of HA. With the increase of the doping amount of F element, spherical HA particles gradually transformed into the rod-like structure. When the ratio of F/P was 0. 25, HA particles with small and uniform can be obtained. The bacteriostatic ring test indicated that the Na/Mg/F co-doping HA had an inhibitory effect on growth of Staphylococcus aureus. While the ratio of F/P was 0. 25, HA powders possessed the best antibacterial activity. The phase of HA calcined at 1000 ℃ did not change showed its good thermal stability.
    Experimental Study on Composition Design and Performance of Foamed Cement Banking with Slag Powder
    GAO Ying-li;MA Lu;GUAN Hong-xin;MA Xu
    2017, 36(1):  352-358. 
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    The mixture ratio design parameters of FCB with slag powder using in roadbed replacement were proposed by orthogonal experiments, and the effects on compressive strength of FCB of amount of cementitious materials, dosage of slag powder and water binder ratio were studied when the water binder ratio is in the range of 0. 5-0. 6, further the drying shrinkage and frost resistance of FCB were studied. The results show that the ratio of cement, slag powder, foaming agent and water is 1∶0. 54∶0. 03∶0. 85 is the initial mixture ratio of FCB with slag powder. The effect order on the compressive strength of FCB is amount of cementitious materials, dosage of slag powder, water binder ratio, with the water binder ratio increases at each age, the dry shrinkage rate first increases,and then decreases, finally increases again, the smallest is of the water binder ratio is 0. 55, and after freezing and thawing cycles, the compressive strength loss rate increases and then decreases, the smallest is of the water binder ratio is 0. 6, with the dosage of slag powder increases at each age, dry shrinkage rate first decreases and then increases, the smallest is of the dosage of slag powder is 35%, and after freezing and thawing cycles, the compressive strength loss rate increases gradually, the smallest is of the dosage of slag powder is 15%.
    Cementing Performance of Activated Coal Gangue Based Unfired Brick
    WU Hong;ZHANG Xu-yong;KONG De-shun;XU Li-fei
    2017, 36(1):  359-364. 
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    The composition of coal gangue powder in Liupanshui mining area was analyzed and the strengths property of original and activated coal gangue based unfired brick were determined. The effects of mechanical, thermal, chemical and compound activation on the coal gangue were systematically studied. The results showed that coal gangue has the characteristics of high silicon content, high iron content in Liupanshui mining area. Activated coal gangue can improve considerably the strengths property unfired brick. The compound activation method is superior to the single activation method. Compound activated coal gangue can enhanced sharply the strengths property of unfired brick , then unfired brick fully meets the standard of JC/T422-91 (96) MU15.
    Early Property and High Temperature Resistance of Alkali Activated System of Fly Ash-Slag
    LI Qi-hua;DING Tian-ting;CHEN Shu-dong
    2017, 36(1):  365-368. 
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    Geopolymer is a new type of binding materials with good performance composed of inorganic silicon aluminum materials and alkaline solution. Water glass solutions were made with different modulus and solid content,and the alkali-activated effect on fly ash-slag system were investigated. The influence of high temperature on mechanical property was studied. The results show water glass with modulus of 1. 4 and solid content of 25% is optimal and high temperature curing contributes to mechanical property improvement.
    Preparation and Properties of Low Air-entraining and Shrinkage-reducing Polycarboxylate Superplasticizer
    ZHANG Ming
    2017, 36(1):  369-373. 
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    The crack of concrete caused by shrinkage is a serious problem. A low air-entraining and shrinkage-reducing polycarboxylate superplasticizer was prepared by different type and molecular macro-monomer BPEGMA, MAA, shrinkage-reducing monomer DPGMAL and de-foaming monomer PPGA400. The influences of the amount of all the materials were discussed. The optimal molar ratio of BPEGMA1000, MAA, DPGMAL and PPGA400 was 1∶3. 2∶0. 6∶0. 3. Compared with the like product in the market, the copolymer had the better water-reducing, shrinkage-reducing and lower air-entraining property.
    Red Oil Drop Glaze Fired at Lower Temperature by Using Red Mud
    WU Yu-min;DU Ji-wei;ZHU Jian-ping;HUANG Ding-guo
    2017, 36(1):  374-379. 
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    In order to reduce the preparation cost and recycle industrial waste, low temperature re d oil drop glaze was preparated at about 1120 ℃ which using red mud as main sources of iron oxide. The effects of the contents of Al2 O3 ,B2 O3 , CaO, MgO ,Fe2 O3 ,ZnO on the glaze glassiness and the red oil drop effect were studied. The results show that the formation of the oil drop glaze mainly based on the phase separation of the glaze. B2 O3 and ZnO can impel glass phase separation, reduce the melting temperature and increase the transparency of the glaze. CaO and Al2 O3 can control phase separation of the glaze and structure of phase separation. Fe2 O3 is enriched in oil droplets. ZnO and MgO have a great influence on the colour of the oil drop glaze, the colour of oil drop glaze changes from black to brownish red with the increase of ZnO, and the colour of oil drop glaze changes from brown to black with the increase of MgO. The effect of glaze thickness on the oil drop glaze were also studied, when the glaze thickness is 1-1. 5 mm, the glaze has the best oil drop effect.
    Preparation and Characterization of Ni2+-Al3+-MoO2-4 -LDHs Corrosion Inhibitor
    LIU Jie-ying;DANG Rui;LI Mei;MA Xiang-rong;LIU Dan;LI Xiao-hong;FENG Rong-li
    2017, 36(1):  380-384. 
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    Using carbamide as precipitant, Ni2+-Al3+-CO2-3 -LDHs was prepared by homogeneous precipitation method when the Ni/Al molar ratis was 3∶1. Then the corrosion inhibitor of Ni2+-Al3+-MoO2-4 -LDHs was successfully constructed through ion exchange with NaCl and Na2 MoO4 · 2H2 O respectively using Ni2+-Al3+-CO2-3 -LDHs as precursor. The synthesized Ni2+-Al3+-MoO2-4 -LDHs were characterized by XRD, SEM, FT-IR, TG-DTG and ICP. The experimental results show that the basal spacing of the LDHs increases from 0. 769 nm to 0. 982 nm when the MoO2-4 anions insert to the layer space of Ni2+-Al3+-LDHs, which show well-crystalline structure and layered feature.
    Performance of Flue Gas Desulfurization by Desulfurized Slag-Novel Biomass Activated Carbon
    GU Heng-xing;DONG Shuo;CHEN Hua;YANG Gang;ZHANG Hao;LIU Xiu-yu
    2017, 36(1):  385-390. 
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    Using walnut shell of agricultural waste as raw material and desulfurized slag of steelmaking by-products as additive, desulfurized slag-novel biomass activated carbon was prepared by blending method. The desulfurized slag-novel biomass activated carbon was used for flue gas desulphurization in a fixed-bed reactor. The impact of operating parameters such as SO2 inlet concentration, space velocity, bed temperature, moisture content and O2 concentration on the desulfurization efficiency of desulfurized slag-novel biomass activated carbon was investigated. The results show that with the increase of SO2 inlet concentration and space velocity, breakthrough sulfur capacity and desulfurization penetration time of desulfurized slag-novel biomass activated carbon were reduced. Bed temperature was a significant factor. Moisture content and O2 concentration were beneficial to chemical adsorption of desulfurized slag-novel biomass activated carbon. The optimal process parameters desulfurization of desulfurized slag-novel biomass activated carbon, such as SO2 inlet concentration, space velocity, bed temperature, moisture content and O2 concentration were 0. 25%, 750 h-1 , 85 ℃, 9% and 12% respectively. The breakthrough sulfur capacity is 274. 1 mg/g and desulfurization penetration time is 31 h.
    Repair Performance of Magnesium Ammonium Phosphate Cement(MAPC) Mending Materials
    JIANG Zi-chao;ZHANG Shi-hao;FANG Han-ming;SHEN Lin
    2017, 36(1):  391-395. 
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    Portland cement mortar was repaired by magnesium ammonium phosphate cement ( MAPC ) . The repair performance of MAPC was studied by designed test. The results show that the strength of MAPC repair material is good, and the 28 d compressive strength can reach 77. 5 MPa. The bond performance between MAPC repair material and the old ordinary portland cement mortar is good. The smaller M/P ratio is beneficial to the improvement of early bond performance. Repair division of MAPC have excellent anti-permeability performances. Decreasing the ratio of M/P or increasing the ratio of water to cement reduces the anti-permeability.
    Effect of Al2 O3 on Structure and Properties of Borosilicate Glass
    ZHU Kui;CHENG Jin-shu;LU Ping;GUO Zhen-qiang
    2017, 36(1):  396-400. 
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    The borosilicate glass has excellent thermal shock resistance and excellent optical performance. This paper was mainly studied on influence of Al2 O3 on the structure and properties of the borosilicate glass. The structure of borosilicate glass was analyzed by infrared spectra at different contents of Al2 O3 . The thermal expansion coefficient, transition temperature, softening temperature, viscosity and chemical stability of the glass were tested. The result show that: with the addition of Al2 O3 , the [ BO4 ] in the glass structure decreased, and the [ BO3 ] increased correspondingly, so glass structure becomes more loose;The thermal expansion coefficient of glass is increased, and the Tg and the expansion softening point Td decrease, the chemical stability is reduced; However, the softening point Tf of the glass decreases with the increase of the Al2 O3 content when the Al2 O3 content is less than 3%, and it is opposite when the Al2 O3 content is more than 3%. the high temperature viscosity of the glass increases with the addition of Al2 O3 , but the low temperature viscosity decreases.
    Activation Mechanism of Mg2+on Muscovite in Sodium Oleate System
    PENG Xiang-yu;WANG Yu-bin;ZHANG Xiao-bo;LI Shuai
    2017, 36(1):  401-407. 
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    Aimed at sodium oleate system, the effect of Mg2+ on the flotation behavior of muscovite was investigated then the activation mechanism of Mg2+ on muscovite was detected by means of flotation solution chemical, Zeta potential and XPS spectra etc. The result shows that muscovite can be activated significantly by Mg2+ under alkaline conditions and the greater pH value, the better activation effect of Mg2+ on the muscovite. The muscovite recovery rate reached 82. 20% when the amount of sodium oleate and Mg2+ was 9. 20 × 10 -4 mol/L and 3. 44 × 10 -4 mol/L respectively at pH=12. The radical activation cause of Mg2+ on muscovite is it can enhance oleate ions' electrostatic adsorption on local positive region of muscovite surface and increase the reaction probability of oleate ions with reactive Al and Si on muscovite surface. Furthermore, the magnesium ion covering on muscovite surface can react with oleic acid ions to generate hydrophobic magnesium oleate. So muscovite floatability can be significantly improved under the combined action of these three factors.
    Effect of Class G HSR Oil Well Cement Property on Performance of Cementing Slurry
    YU Bin;SUN Chao;ZHAO Hu;LUO Yu-wei;JIANG Jing-shuai;DAN Mei-han
    2017, 36(1):  408-413. 
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    The property of class G cement mainly affect the performance of the cementing quality. The property of four different class G oil well cement was tested and the effect of these property on the performance of the cementing slurry, such as thickening time, rheology and compressive strength was studied. The results show that the following items. The fineness and mineral composition of the class G oil well cement mainly affect the rheology of the cement slurry. The aluminate phase ( C3 A+C4 AF) is the key reason of the compatibility of cement and additive. The type and content of gypsum severely affect the thickening time of the cementing slurry.
    Carboxymethyl Cellulose Reinforced Calcium Sulfate Hemihydrate Composite for Bone Repair
    HAN Yang-yang;HOU Zhi-yi;WANG Wei-hong
    2017, 36(1):  414-418. 
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    The carboxymethyl cellulose were used to reinforce calcium sulfate hemihydrates ( CSH ) to make it more suitable for bone repair. The compressive strength of the composites was evaluated and an optimistic fiber level was concluded. When 3% cellulosic fiber was added to CSH the resulted composite could stand 42 MPa compressive force. By using X-ray diffraction scans and electric scan microscope, the crystal of CSH and distribution of fibers were analyzed. Excessive fibers resulted in the uneven distribution in CSH matrix and creation of calcium sulfate dihydrate, which would decrease the compressive strength of the composites. The result of soaking samples in phosphate buffer solution proved that the anti-washout of CSH obviously improved when carboxymethyl cellulose were introduced.
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Journal Information
Start Pub: 1982 Monthly
Name: Bulletin of The Chinese Ceramic Society
Responsible Institution: China Association for Science and Technology
Sponsor: The Chinese Ceramic Society
Research Institute of Synthetic Crystals Co.,Ltd.
Chief Editor: MIAO Changwen
Executive Chief Editor: PENG Zhenzhen
ISSN: 1001-1625
CN: 11-5440/TQ
Tel: +86-10-65492968
Post Code: M5655
Price: 100 Yuan
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