白糖和葡萄糖酸钠二元复合对长螺旋咬合桩用超缓凝混凝土性能的影响

摘要/Abstract

摘要： 为解决咬合桩施工现场超缓凝混凝土的制备问题,探究缓凝剂的作用机理,采用白糖和葡萄糖酸钠按质量比7∶3配制复合缓凝剂,对比一次搅拌和二次搅拌工艺,制备超缓凝混凝土。采用抗压抗折一体化试验机、环境扫描电子显微镜(ESEM)、总有机碳分析仪和等温量热仪测试分析超缓凝混凝土的力学性能、微观形貌、吸附量和水化性能。结果表明,混凝土的凝结时间随着缓凝剂掺量的增加而延长。当缓凝剂掺量为0.38%(质量分数)时,一次搅拌组初、终凝时间分别为31 h和46 h,二次搅拌组初、终凝时间分别为34 h和50 h;当缓凝剂掺量为0.50%(质量分数)时,一次搅拌组初、终凝时间分别为61 h和78 h,二次搅拌组初、终凝时间分别为65 h和84 h。两种掺量下,混凝土56 d抗压强度均达到40 MPa以上,满足两种工况的施工要求。采用二次搅拌工艺制备超缓凝混凝土有助于进一步延长混凝土的凝结时间,改善混凝土拌合物的流动性,但会略微降低混凝土的抗压强度。不同缓凝剂在水泥颗粒表面的吸附能力强弱顺序为:葡萄糖酸钠>白糖-葡萄糖酸钠>白糖>白糖-葡萄糖酸钠后掺。缓凝剂的掺入起到降低水化放热,抑制水泥水化的作用,从而延长混凝土的凝结时间。

关键词: 超缓凝混凝土, 复合缓凝剂, 咬合桩, 二次搅拌, 吸附量, 水化热

Abstract: In order to solve the preparation problem of super-retarding concrete at the construction site of bite pile and explore the mechanism of retarder, the super-retarding concrete was prepared by adding sugar and sodium gluconate with a mass ratio of 7∶3 as composite retarder, and two kinds of preparing process, namely the primary stirring process and secondary stirring process were compared. The mechanical properties, microstructure, adsorption amount and hydration properties of super-retarding concrete were tested and analyzed by compressive and flexural testing machine, environmental scanning electron microscope (ESEM), total organic carbon analyzer and isothermal calorimeter. The results show that the setting time of concrete increases with the increase of retarder content. When the content of retarder is 0.38% (mass fraction), the initial and final setting time of the first stirring group are 31 h and 46 h, respectively, and the initial and final setting time of the second stirring group are 34 h and 50 h, respectively. When the content of retarder is 0.50% (mass fraction), the initial and final setting time of the first stirring group are 61 h and 78 h, respectively, and the initial and final setting time of the second stirring group are 65 h and 84 h, respectively. Under the two dosages, the 56 d compressive strength of concrete is all above 40 MPa, which can meet the construction requirements of the two working conditions. The secondary stiring process is helpful to further prolong the setting time of concrete and improve the fluidity of concrete mixture, but slightly reduce the compressive strength of concrete. The order of adsorption capacity of different retarders on the surface of cement particles is: sodium gluconate>sugar-sodium gluconate>sugar>sugar-sodium gluconate after blending. Mixing retarder can reduce hydration heat and restrain hydration of cement, so as to prolong setting time of concrete.

Key words: super-retarding concrete, composite retarder, bite pile, secondary stirring, adsorption amount, hydration heat

中图分类号:

TU528

刘世成, 曹开伟, 徐升才, 王信刚, 王睿, 朱街禄. 白糖和葡萄糖酸钠二元复合对长螺旋咬合桩用超缓凝混凝土性能的影响[J]. 硅酸盐通报, 2022, 41(12): 4214-4224.

LIU Shicheng, CAO Kaiwei, XU Shengcai, WANG Xingang, WANG Rui, ZHU Jielu. Effect of Sugar and Sodium Gluconate Binary Compound on Performance of Super-Retarding Concrete for Long Spiral Bite Piles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4214-4224.

参考文献

[1] 何少锋,李丙明,黄文钦,等.咬合桩发展综述[J].福建建材,2015(7):12-14+38.
HE S F, LI B M, HUANG W Q, et al. Overview of occlusal pile development[J]. Fujian Building Materials, 2015(7): 12-14+38 (in Chinese).
[2] 徐华仙.超缓凝混凝土在钻孔咬合桩中的应用研究[J].城市建设理论研究(电子版),2017(18):161.
XU H X. Research on the application of super-retarded concrete in drilling bite pile[J]. Theoretical Research in Urban Construction, 2017(18): 161 (in Chinese).
[3] 曹良桂,何锐波,王世强,等.水下超缓凝混凝土在钻孔咬合桩中的应用[J].混凝土与水泥制品,2017(10):82-84.
CAO L G, HE R B, WANG S Q, et al. Application of underwater super-retarding concrete in bored lock piles[J]. China Concrete and Cement Products, 2017(10): 82-84 (in Chinese).
[4] 胡鹏飞.C30超缓凝混凝土的研究应用[D].成都:西南交通大学,2018.
HU P F. Research and application of C30 ultra-retarded concrete[D]. Chengdu: Southwest Jiaotong University, 2018 (in Chinese).
[5] 陈清志.深圳地铁工程钻孔咬合桩超缓凝混凝土的配制与应用[J].混凝土与水泥制品,2002(2):21-23.
CHEN Q Z. Preparation and application of super-retarded concrete for drilling bite piles in Shenzhen Metro Project[J]. Chinal Concrete and Cement Products, 2002(2): 21-23 (in Chinese).
[6] 徐辉,李克亮,邢有红,等.混凝土超缓凝剂在钻孔咬合桩施工中的研究与应用[J].建筑科学,2008,24(7):48-51.
XU H, LI K L, XING Y H, et al. Development and application of super setting retarder for the concrete of bored lock piles[J]. Building Science, 2008, 24(7): 48-51 (in Chinese).
[7] 石从黎,段瑞斌,宋开伟.预拌混凝土的超时缓凝现象及处理方法[J].混凝土,2011(1):106-107+133.
SHI C L, DUAN R B, SONG K W. Phenomenon and treatment of overtime retarding in ready mixed concrete[J]. Concrete, 2011(1): 106-107+133 (in Chinese).
[8] 王芳利,邓旭华.超缓凝高性能混凝土的试验与应用研究[J].广东土木与建筑,2019,26(6):66-69.
WANG F L, DENG X H. Experimental and applied research on ultra-slow setting high performance concrete[J]. Guangdong Architecture Civil Engineering, 2019, 26(6): 66-69 (in Chinese).
[9] 沈焱,王香港,余振新,等.葡萄糖酸钠对混凝土基本性能的影响[J].江苏建材,2014(5):27-30.
SHEN Y, WANG X G, YU Z X, et al. Effect of sodium gluconate on the basic performance of concrete[J]. Jiangsu Building Materials, 2014(5): 27-30 (in Chinese).
[10] 杨海平,竹宇波.缓凝剂对混凝土性能影响研究[J].新型建筑材料,2019,46(9):102-104+169.
YANG H P, ZHU Y B. Study on the effect of retarder on concrete performance[J]. New Building Materials, 2019, 46(9): 102-104+169 (in Chinese).
[11] XU J L. Study on admixture of super retarding concrete[J]. IOP Conference Series: Earth and Environmental Science, 2021, 621(1): 012101.
[12] 段瑞斌,谢勇剑,林湘生,等.不同缓凝剂对预拌砂浆性能影响试验研究[J].广东建材,2015,31(1):16-18.
DUAN R B, XIE Y J, LIN X S, et al. Experimental study on the effect of different retarders on the performance of ready-mixed mortar[J]. Guangdong Building Materials, 2015, 31(1): 16-18 (in Chinese).
[13] KASSA Y. Application of cane molasses as concrete retarder admixture[J]. SN Applied Sciences, 2019, 1(12): 1-7.
[14] 吴宗道.钙矾石的显微形貌[J].中国建材科技,1995,4(4):9-14+3.
WU Z D. Micromorphology of ettringite[J]. China Building Materials Science ＆ Technology, 1995, 4(4): 9-14+3 (in Chinese).
[15] 潘莉莎,邱学青,庞煜霞,等.减水剂对水泥水化行为的影响[J].硅酸盐学报,2007,35(10):1369-1375.
PAN L S, QIU X Q, PANG Y X, et al. Effect of water reducers on hydration behavior of cement[J]. Journal of the Chinese Ceramic Society, 2007, 35(10): 1369-1375 (in Chinese).
[16] 谭洪波,林超亮,马保国,等.分次加入不同缓凝剂与聚羧酸减水剂二元体系保坍性的研究[J].硅酸盐通报,2015,34(4):1015-1020.
TAN H B, LIN C L, MA B G, et al. Research on the concrete-slump-lost controlling ability in binary system of different retarder and polycarboxylate superplasticizer under the condition of separate addition[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(4): 1015-1020 (in Chinese).
[17] 谭洪波,李信,马保国,等.基于后掺法的混凝土坍落度恢复技术研究[J].武汉理工大学学报,2014,36(9):32-36.
TAN H B, LI X, MA B G, et al. Technology research about recovery of concrete slump loss based on superplasticizer later added[J]. Journal of Wuhan University of Technology, 2014, 36(9): 32-36 (in Chinese).
[18] 李顺,余其俊,韦江雄,等.分子量及其分布对聚羧酸减水剂吸附行为的影响(英文)[J].硅酸盐学报,2011,39(1):80-86.
LI S, YU Q J, WEI J X, et al. Effects of molecular mass and its distribution on adsorption behavior of polycarboxylate water reducers[J]. Journal of the Chinese Ceramic Society, 2011, 39(1): 80-86.
[19] 于小荣.大温差两性离子缓凝剂的制备及在低密度水泥浆中的应用[D].成都:西南石油大学,2017.
YU X R. Preparation of zwitterionic retarders for large temperature difference and its application in light weight cement slurry[D]. Chengdu: Southwest Petroleum University, 2017 (in Chinese).
[20] 于小荣,肖雪,尤星,等.复合离子缓凝剂在水泥颗粒表面的吸附行为[J].硅酸盐通报,2019,38(10):3349-3354.
YU X R, XIAO X, YOU X, et al. Adsorption behavior of compound-ion retarder on cement particle surface[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(10): 3349-3354 (in Chinese).
[21] 童斌,宋旭艳,李东旭,等.纳米改性减水剂对水泥流变性及水化热的影响[J].非金属矿,2021,44(5):31-35.
TONG B, SONG X Y, LI D X, et al. Effect of nano-modified superplasticizer on rheological properties and hydration heat of cement paste[J]. Non-Metallic Mines, 2021, 44(5): 31-35 (in Chinese).
[22] 王成启,高海浪,田峻源.聚羧酸高性能减水剂对水泥水化热的影响[J].混凝土,2018(11):1-4+8.
WANG C Q, GAO H L, TIAN J Y. Effect of polycarboxylic acid high performance water reducing agent on cement heat of hydration[J]. Concrete, 2018(11): 1-4+8 (in Chinese).
[23] 田志宗,陈登,张艳,等.白云石粉细度对白云石粉-水泥水化性能的影响[J].非金属矿,2021,44(5):11-14.
TIAN Z Z, CHEN D, ZHANG Y, et al. Effect of dolomite powder fineness on hydration properties of dolomite-cement[J]. Non-Metallic Mines, 2021, 44(5): 11-14 (in Chinese).
[24] 谭洪波,林超亮,马保国,等.磷酸盐对普通硅酸盐水泥早期水化的影响[J].武汉理工大学学报,2015,37(2):1-4.
TAN H B, LIN C L, MA B G, et al. Effect of phosphate on the hydration of Portland cement at early age[J]. Journal of Wuhan University of Technology, 2015, 37(2): 1-4 (in Chinese).
[25] WANG D H, YAO X, YANG T, et al. Controlling the early-age hydration heat release of cement paste for deep-water oil well cementing: a new composite designing approach[J]. Construction and Building Materials, 2021, 285: 122949.
[26] CHAEI M G, AKBARNEZHAD A, CASTEL A, et al. Precision of cement hydration heat models in capturing the effects of SCMs and retarders[J]. Magazine of Concrete Research, 2018, 70(23): 1217-1231.