磷石膏粒径对湿拌砂浆性能及微观结构的影响研究

摘要/Abstract

摘要： 选取四种不同粒径磷石膏,分别与机制砂、水泥及外加剂混合制备了湿拌砂浆,考察了磷石膏粒径对砂浆工作性及力学性能的影响,并通过XRD、TG-DSC、MIP以及SEM测试探究了磷石膏粒径对湿拌砂浆水化产物及微观结构的影响机理。结果表明,随着磷石膏粒径增大,湿拌砂浆工作性及力学性能呈先增大后减小的趋势,当掺入30%(质量分数)粒径为53~106 μm的磷石膏时,湿拌砂浆稠度损失19%,保水率为90%,28 d抗压强度为10.7 MPa,14 d拉伸黏结强度为0.25 MPa,可满足抗压强度大于10 MPa的技术指标要求。随着磷石膏粒径增大,磷石膏中的共晶磷含量减少,水泥水化过程受抑制程度减弱,砂浆中水化硅酸钙(C-S-H)生成量增多,且在远离CaSO₄·2H₂O颗粒的区域有大量C-S-H出现。然而,砂浆硬化体的孔体积却呈先减小后增大的趋势,当掺入30%(质量分数)粒径为53~106 μm的磷石膏时,砂浆的孔体积最小,仅为0.130 9 mL/g。磷石膏粒径范围适宜控制在53~106 μm,此时湿拌砂浆具有良好的工作性及力学性能。

关键词: 磷石膏, 粒径, 工作性, 力学性能, 微观结构, 物相组成

Abstract: Four kinds of phosphogypsum with different particle sizes were selected and mixed with mechanical sand, cement and admixtures to prepare wet-mixed mortar. The effects of phosphogypsum particle size on the workability and mechanical properties of mortar were investigated, and the mechanism of phosphogypsum particle size on the hydration products and microstructure of wet-mixed mortar was investigated by XRD, TG-DSC, MIP and SEM test. The results show that with the increase of phosphogypsum particle size, the workability and mechanical properties of wet-mixed mortar show a trend of increase first and then decrease. When 30% (mass fraction) phosphogypsum with particle size of 53~106 μm is added, the wet-mixed mortar consistency loss is 19%, water retention rate is 90%, 28 d compressive strength is 10.7 MPa, 14 d tensile bond strength is 0.25 MPa, which can meet the requirements of compressive strength greater than 10 MPa. With the increase of phosphogypsum particle size, the eutectic phosphorus content in phosphogypsum decreases, the hydration process of cement is inhibited to a lesser extent, the calcium silicate hydrate (C-S-H) generated in mortar increases, and a large amount of C-S-H appears in the region away from CaSO₄·2H₂O particles.However, the pore volume of mortar hardening body shows a trend of decrease first and then increase, when 30% (mass fraction) phosphogypsum with particle size of 53~106 μm is added, the pore volume of mortar is the smallest, only 0.130 9 mL/g. Phosphogypsum particle size range is suitable to be controlled in 53~106 μm, at this time, the wet-mixed mortar has good workability and mechanical properties.

Key words: phosphogypsum, particle size, workability, mechanical property, microstructure, phase composition

中图分类号:

TQ177.172

张粤, 王宏杰, 杨林, 陈鸿, 曹建新. 磷石膏粒径对湿拌砂浆性能及微观结构的影响研究[J]. 硅酸盐通报, 2022, 41(8): 2836-2843.

ZHANG Yue, WANG Hongjie, YANG Lin, CHEN Hong, CAO Jianxin. Influence of Phosphogypsum Particle Size on Properties and Microstructure of Wet-Mixed Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2836-2843.

参考文献

[1] 石鑫,杨绍利,马兰.“三石膏”综合利用现状及其新工艺[J].现代化工,2020,40(9):8-13+19.
SHI X, YANG S L, MA L. Present situation of comprehensive utilization of “three-gypsum” and new technologies[J]. Modern Chemical Industry, 2020, 40(9): 8-13+19 (in Chinese).
[2] 周远忠,王宏杰,陈鸿,等.二水磷石膏配制水泥基湿拌抹灰砂浆试验研究[J/OL].无机盐工业:1-8.DOI:10.19964/j.issn.1006-4990.2021-0663.
ZHOU Y Z, WANG H J, CHEN H, et al. Experimental study on the formulation of cement-based wet-mix plaster mortar with phosphogypsum dihydrate[J]. Inorganic Salt Industry: 1-8. DOI:10.19964/j.issn.1006-4990.2021-0663 (in Chinese).
[3] 李永靖,岳玮琦,潘铖,等.预处理工艺影响磷石膏水泥砂浆性能研究[J].非金属矿,2018,41(1):15-17.
LI Y J, YUE W Q, PAN C, et al. Study on influence of pretreatment process on phosphogypsum and slag cement[J]. Non-Metallic Mines, 2018, 41(1): 15-17 (in Chinese).
[4] YANG L, ZHANG Y S, YAN Y. Utilization of original phosphogypsum as raw material for the preparation of self-leveling mortar[J]. Journal of Cleaner Production, 2016, 127: 204-213.
[5] 阮征,陈力,洪建,等.骨料和砂浆等影响混凝土强度的细观层次机理分析[J].建筑材料学报,2014,17(6):952-958.
RUAN Z, CHEN L, HONG J, et al. Mesoscopic analysis on the mechanism of effects of aggregate and mortar on concrete strength[J]. Journal of Building Materials, 2014, 17(6): 952-958 (in Chinese).
[6] 朱哲誉,王中平,周玥,等.硅酸盐水泥水化产物微纳结构的原位研究[J].硅酸盐学报,2021,49(8):1699-1705.
ZHU Z Y, WANG Z P, ZHOU Y, et al. In-situ study on micro-nano structure of Portland cement hydration products[J]. Journal of the Chinese Ceramic Society, 2021, 49(8): 1699-1705 (in Chinese).
[7] 彭家惠,万体智,汤玲,等.磷石膏中的有机物、共晶磷及其对性能的影响[J].建筑材料学报,2003,6(3):221-226.
PENG J H, WAN T Z, TANG L, et al. Organic matters and P₂O₅ in crystal lattice and their influence on properties of phosphogypsum[J]. Journal of Building Materials, 2003, 6(3): 221-226 (in Chinese).
[8] 郭远新,李秋义,苏敦磊,等.基于多重因素的再生粗骨料混凝土用水量预测公式[J].硅酸盐通报,2018,37(6):1936-1940.
GUO Y X, LI Q Y, SU D L, et al. Prediction formula of water consumption of recycled coarse aggregate concrete based on multiple factors[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(6): 1936-1940 (in Chinese).
[9] 马昆林,莫文波,莫建红,等.砖混再生细骨料再生砂浆性能及工程应用[J].铁道科学与工程学报,2021,18(8):2073-2080.
MA K L, MO W B, MO J H, et al. Performance and engineering application of brick-concrete recycled fine aggregate mortar[J]. Journal of Railway Science and Engineering, 2021, 18(8): 2073-2080 (in Chinese).
[10] 杨医博,李之吉,陈百曦,等.废弃混凝土制全再生细骨料在湿拌砂浆中应用的实验研究[J].新型建筑材料,2020,47(5):37-41.
YANG Y B, LI Z J, CHEN B X, et al. Experimental study of recycled total-fine aggregate from waste concrete in wet mortar[J]. New Building Materials, 2020, 47(5): 37-41 (in Chinese).
[11] 杨奇玮,杨新亚,王义恒,等.细骨料和减水剂对石膏基自流平砂浆性能影响研究[J].新型建筑材料,2021,48(2):88-91.
YANG Q W, YANG X Y, WANG Y H, et al. Research on effects of fine aggregate and superplasticizer on performance of gypsum based self-leveling mortar[J]. New Building Materials, 2021, 48(2): 88-91 (in Chinese).
[12] 韩建国,阎培渝,侯维红.C₄A₃$-CaSO₄-CaO体系在硅酸盐水泥浆体中的膨胀机理[J].硅酸盐学报,2016,44(11):1543-1551.
HAN J G, YAN P Y, HOU W H. Expansion mechanism of C₄A₃$-CaSO₄-CaO in Portland cement paste[J]. Journal of the Chinese Ceramic Society, 2016, 44(11): 1543-1551 (in Chinese).
[13] 韩建国,阎培渝,侯维红.C₄A₃$-CaSO₄-CaO体系在硅酸盐水泥浆体中的膨胀能力[J].硅酸盐学报,2016,44(8):1120-1125.
HAN J G, YAN P Y, HOU W H. Expansion character of C₄A₃$-CaSO₄-CaO system in Portland cement paste[J]. Journal of the Chinese Ceramic Society, 2016, 44(8): 1120-1125 (in Chinese).
[14] 赵德强,张昺榴,沈卫国,等.磷石膏对微膨胀水泥孔隙液及水化产物的影响[J].建筑材料学报,2020,23(6):1273-1281.
ZHAO D Q, ZHANG B L, SHEN W G, et al. Effect of phosphogypsum on pore solution and hydration products of slight-expansive cement[J]. Journal of Building Materials, 2020, 23(6): 1273-1281 (in Chinese).
[15] 杨志全,丁一,杨溢,等.不同水灰比的牛顿型水泥浆液流变性随时间变化规律[J].农业工程学报,2020,36(19):161-167.
YANG Z Q, DING Y, YANG Y, et al. Hydration-time-dependent rheological behaviors of Newtonian cement grouts with different water cement ratios[J]. Transactions of the Chinese Society of Agricultural Engineering, 2020, 36(19): 161-167 (in Chinese).
[16] 宋慧,徐多,向君正,等.骨料及水灰比对透水混凝土性能的影响[J].水利水电技术,2019,50(9):18-25.
SONG H, XU D, XIANG J Z, et al. Influence of aggregate and water-cement ratio on the pervious concrete performance[J]. Water Resources and Hydropower Engineering, 2019, 50(9): 18-25 (in Chinese).
[17] 蔡开朗,廖其龙.钙矾石类膨胀剂膨胀效能的作用及机理研究[J].非金属矿,2019,42(3):48-51.
CAI K L, LIAO Q L. The expansion efficiency of ettringite type expansion agent and its mechanism[J]. Non-Metallic Mines, 2019, 42(3): 48-51 (in Chinese).
[18] WANG Q, JIA R Q. A novel gypsum-based self-leveling mortar produced by phosphorus building gypsum[J]. Construction and Building Materials, 2019, 226: 11-20.
[19] ANDRADE NETO J S, BERSCH J D, SILVA T S M, et al. Influence of phosphogypsum purification with lime on the properties of cementitious matrices with and without plasticizer[J]. Construction and Building Materials, 2021, 299: 123935.
[20] 赵士豪,林喜华,麻鹏飞,等.基于临界钙矾石膨胀破坏的磷石膏基复合胶凝材料的配料计算研究[J].无机盐工业,2020,52(9):91-95.
ZHAO S H, LIN X H, MA P F, et al. Study on formulation calculation of phosphogypsum-based composite cementitious materials based on expansion and failure of critical AFt[J]. Inorganic Chemicals Industry, 2020, 52(9): 91-95 (in Chinese).
[21] 吴中伟,张鸿直.膨胀混凝土[M].北京:中国铁道出版社,1990.
WU Z W, ZHANG H Z. Expanded concrete[M]. Beijing: China Railway Press, 1990 (in Chinese).
[22] 张宁,孙振平,李扣兰.多元胶凝体系自流平砂浆钙矾石生成控制及机理[J].新型建筑材料,2019,46(1):13-16.
ZHANG N, SUN Z P, LI K L. Control and mechanism of ettringite in self-leveling mortar of multi-component cementitious system[J]. New Building Materials, 2019, 46(1): 13-16 (in Chinese).
[23] 刘通,于本田,王焕,等.高吸附性石粉含量对水泥砂浆力学性能及微观结构的影响[J].公路交通科技,2021,38(8):16-22.
LIU T, YU B T, WANG H, et al. Influence of high adsorbent stone powder content on mechanical properties and microstructure of cement mortar[J]. Journal of Highway and Transportation Research and Development, 2021, 38(8): 16-22 (in Chinese).
[24] KHAYRUTDINOVA D R, ANTONOVA O S, GOLGBERG M A, et al. The effect of phosphate groups on the structure and properties of bone cements based on calcium sulfate[J]. Doklady Chemistry, 2020, 493(2): 117-120.