Improvement of Adaptability of Polycarboxylate Superplasticizer to Montmorillonite by Anti-clay Agent and Its Mechanism

被引：0
|
作者：
Wang F. [1 ,2 ]
Lu J. [1 ,2 ]
Liu J. [1 ,2 ]
Sha J. [1 ,2 ]
Zhao S. [1 ,2 ]
机构：
[1] Jiangsu Sobute New Materials Co., Ltd., Nanjing
[2] State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2017年 / 20卷 / 04期
关键词：
Anti-clay agent; Mechanism; Montmorillonite(MMT); Paste; Polycarboxylate superplasticizer;
D O I：
10.3969/j.issn.1007-9629.2017.04.011
中图分类号：
学科分类号：
摘要：
Through fluidity of cement paste the improvement of dispersion property of polycarboxylate superplasticizer(PCE) after adding montmorillonite by anti-clay agent(JJA-KNJ) can be evaluated, and its mechanism can be elucidated by TOC, TG, XRD and SEM. The results show that anti-clay agents(JJA-KNJ) can improve the dispersion of PCE after adding montmorillonite and significantly increase the dispersion of PCE with time and enhance the slump retention performance. When JJA-KNJ and PCE coexist in the synthetic cement pore solution, JJA-KNJ decreases with the adsorption of PCE on montmorillonite. Montmorillonite surface becomes smoother and forms smaller pores after anti-clay agents JJA-KNJ; cationic polar terminal of JJA-KNJ dissolves in water and adsorbes on the surface of the montmorillonite particles, thus forming a layer of organic cationic polymer protective film to prevent the side chain of PCE onto montmorillonite interlayer. JJA-KNJ has a significant stabilizing effect under alkaline conditions of hydration of cement, stabilizing effect will not be significant attenuation with the extension of time. © 2017, Editorial Department of Journal of Building Materials. All right reserved.
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页码：556 / 562
页数：6
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