Effect of Compounding of Viscosity Reducing Admixtures on Hydration Performance of Cement

Abstract

Abstract: This study aimed to address the problem of high viscosity and poor workability of high-strength and ultra-high-strength concrete mixtures caused by high usage of binding materials and low water-binder ratios, which in turn affects construction quality, by developing a new type of reducing agent admixture. The reducing agent admixture was formulated using polycarboxylic acid water-reducing agent mother liquor, defoaming agents, air-entraining agents, rheological agents, retarders, and early-strength agents as functional additives. Single-factor experiments and orthogonal experiments were performed to investigate the effects of different components on the viscosity, flowability, and strength of cement paste and mortar, in order to determine the optimal ratio of the reducing agent admixture. The influence of the reducing agent admixture on hydration heat and hydration products of cement was investigated by conducting micro-tests on hydration heat and XRD. The experimental results show that the mass ratio of optimal preparation process for the reducing agent admixture is water reducer mother liquor∶polyether defoaming agent∶AE-II∶triterpenoid saponin∶rheological agent∶sodium tripolyphosphate∶sodium hexametaphosphate∶sodium gluconate∶citric acid∶sodium thiosulfate∶sodium sulfate=1 000∶3.5∶0.5∶1.5∶4∶10∶5∶15∶5∶15∶10. When a viscosity reducing admixture is added to the cement slurry, the heat release rate of cement hydration is delayed and the amount of hydration products is inhibited.

Key words: viscosity reducing water reducing agent, viscosity, fluidity, hydration reaction, microscopic property, cement paste

CLC Number:

TU528.042.2

WANG Lin, DU Genkun, PAN Yuefan, XU Yubo, TIAN Xiying, GUO Hong. Effect of Compounding of Viscosity Reducing Admixtures on Hydration Performance of Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3947-3957.

References

[1] 王成启, 刘思楠. C100超高强高性能混凝土配制技术的试验研究[J]. 新型建筑材料, 2018, 45(9): 52-55.
WANG C Q, LIU S N. Experimental study of C100 super high strength and high performance concrete compounding technology[J]. New Building Materials, 2018, 45(9): 52-55 (in Chinese).
[2] 徐亮, 凯乐, 尹轮, 等. C100高强混凝土设计制备的试验研究[J]. 重庆建筑, 2022, 21(3): 37-39.
XU L, KAI L, YIN L, et al. Experimental study on design and preparation of C100 high strength concrete[J]. Chongqing Architecture, 2022, 21(3): 37-39 (in Chinese).
[3] 牟龙, 于方, 熊建波, 等. C100超高强泵送混凝土的配制研究[J]. 隧道建设, 2020, 40(6): 793-799.
MU L, YU F, XIONG J B, et al. Study on preparation of C100 ultra-high-strength pumping concrete[J]. Tunnel Construction, 2020, 40(6): 793-799 (in Chinese).
[4] 张明. 低引气减缩型聚羧酸系减水剂合成及性能研究[J]. 硅酸盐通报, 2017, 36(1): 369-373.
ZHANG M. Preparation and properties of low air-entraining and shrinkage-reducing polycarboxylate superplasticizer[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(1): 369-373 (in Chinese).
[5] 汪苏平, 汪源, 胡志豪, 等. 混凝土聚羧酸降黏剂的制备及其应用研究[J]. 新型建筑材料, 2021, 48(1): 72-76.
WANG S P, WANG Y, HU Z H, et al. Study on preparation and application of polycarboxylate acid viscosity reducer for concrete[J]. New Building Materials, 2021, 48(1): 72-76 (in Chinese).
[6] 管文, 谈慕华, 俞海勇, 等. 粉煤灰-水泥浆体的流变性能[J]. 建筑材料学报, 2001, 4(4): 339-345.
GUAN W, TAN M H, YU H Y, et al. Rheological properties of cement pastes with fly ash[J]. Journal of Building Materials, 2001, 4(4): 339-345 (in Chinese).
[7] 李九苏, 肖汉宁, 龚建清. 再生骨料水泥混凝土的级配优化试验研究[J]. 建筑材料学报, 2008, 11(1): 105-110.
LI J S, XIAO H N, GONG J Q. Laboratory research on grading optimization of recycled aggregate concrete[J]. Journal of Building Materials, 2008, 11(1): 105-110 (in Chinese).
[8] 周帅, 佟琳, 陈喜旺. 硅灰对新拌合混凝土流变性能的影响[J]. 建筑技术, 2017, 48(10): 1022-1024.
ZHOU S, TONG L, CHEN X W. Effect of silicon ash on rheological properties of new mixed concrete[J]. Architecture Technology, 2017, 48(10): 1022-1024 (in Chinese).
[9] 马昆林, 龙广成, 谢友均, 等. 水泥-粉煤灰-石灰石粉浆体塑性黏度的影响因素[J]. 硅酸盐学报, 2013, 41(11): 1481-1486.
MA K L, LONG G C, XIE Y J, et al. Factors on affecting plastic viscosity of cement-fly ash-limestone compound pastes[J]. Journal of the Chinese Ceramic Society, 2013, 41(11): 1481-1486 (in Chinese).
[10] 刘石山, 陈灵聪. 基于液桥理论对高强度混凝土降粘性的机理研究[J]. 绿色环保建材, 2020(1): 8-9.
LIU S S, CHEN L C. Research on the mechanism of reducing viscosity of high-strength concrete based on liquid bridge theory[J]. Green Environmental Protection Building Materials, 2020(1): 8-9 (in Chinese).
[11] 唐振清. 减水剂掺量对混凝土性能的影响探究[J]. 江西建材, 2023(5): 52-54+57.
TANG Z Q. Research on the influence of water reducing agent content on concrete performance[J]. Jiangxi Jiancai, 2023(5): 52-54+57 (in Chinese).
[12] CAI J W, DU Y, XU G L, et al. The combined effect of distributing-filling aggregate process and air-entraining agent on the properties of aggregate-interlocking concrete[J]. Materials and Structures, 2022, 55(7): 201.
[13] 王林, 魏子程, 杜艮坤, 等. 超高强混凝土用降粘型外加剂复配技术研究[J]. 混凝土世界, 2023(9): 30-36.
WANG L, WEI Z C, DU G K, et al. Research on compounding technology of viscosity-reducing admixtures for ultra-high strength concrete[J]. China Concrete, 2023(9): 30-36 (in Chinese).
[14] 赵文丽, 侯凯, 周帅. 流变剂对混凝土工作性能的影响[J]. 建筑技术, 2017, 48(10): 1025-1027.
ZHAO W L, HOU K, ZHOU S. Influence of rheological agent working performance of concrete[J]. Architecture Technology, 2017, 48(10): 1025-1027 (in Chinese).
[15] 王亚倩. 抗泥型聚羧酸减水剂的合成及其性能表征[D]. 石家庄: 石家庄铁道大学, 2022.
WANG Y Q. Synthesis and properties characterization of polycarboxyliate superplasticizer for clay tolerance[D]. Shijiazhuang: Shijiazhuang Tiedao University, 2022 (in Chinese).
[16] 段彬, 张明, 齐淑芹. 消泡剂和引气剂对混凝土性能影响的研究[J]. 铁道建筑, 2011, 51(12): 131-133.
DUAN B, ZHANG M, QI S Q. Research on the influence of defoamers and air entraining agents on the performance of concrete [J]. Railway Engineering, 2011, 51(12): 131-133 (in Chinese).
[17] 周帅. 超高层泵送C70混凝土的研究与应用[D]. 哈尔滨: 哈尔滨工业大学, 2021.
ZHOU S. Research and application of super high-rise pumping C70 concrete[D]. Harbin: Harbin Institute of Technology, 2021 (in Chinese).
[18] 罗紫隆, 张全贵, 隗功磊, 等. 不同缓凝剂在复配聚羧酸系减水剂中的性能研究[J]. 混凝土世界, 2016(11): 92-95.
LUO Z L, ZHANG Q G, KUI G L, et al. Study on the performance of different retarders in complex polycarboxylate based water reducing agents [J]. China Concrete, 2016(11): 92-95 (in Chinese).
[19] 何廷树, 申富强, 王福川, 等. 复合使用高效减水剂与缓凝剂对水泥水化历程的影响[J]. 硅酸盐学报, 2007, 35(6): 796-800.
HE T S, SHEN F Q, WANG F C, et al. Influences of combination of superplasticizers and retarders on process of cement hydration[J]. Journal of the Chinese Ceramic Society, 2007, 35(6): 796-800 (in Chinese).
[20] 陈星任. 异戊烯醇聚醚类聚羧酸减水剂的合成、性能及机理研究[D]. 南宁: 广西民族大学, 2023.
CHEN X R. The synthesis, properties and mechanism of isopentenol polyether polyether polycarboxylate superplasticizer[D]. Nanning: Guangxi University for Nationalities, 2023 (in Chinese).
[21] 周俊, 杨睿, 王稚阳, 等. VPEG-降黏型聚羧酸高性能减水剂的制备及其性能研究[J]. 功能材料, 2023, 54(11): 11221-11229.
ZHOU J, YANG R, WANG Z Y, et al. Preparation and properties of VPEG-viscosity-reducing polycarboxylate superplasticizer[J]. Journal of Functional Materials, 2023, 54(11): 11221-11229 (in Chinese).