| 摘要: |
| 采用水泥净浆流动度来评价抗泥剂（JJA KNJ）对加蒙脱土水泥中聚羧酸超塑化剂（PCE）分散性能的改善效果，并结合有机碳含量（TOC），热重（TG），X射线衍射(XRD)，扫描电镜(SEM)分析，研究了JJA KNJ与蒙脱土之间的作用机理.结果表明：抗泥剂JJA KNJ可改善PCE对加蒙脱土水泥的初始分散能力，显著改善PCE对加蒙脱土水泥的经时分散能力，提高其保坍性能；当PCE与JJA KNJ同时存在时，JJA KNJ能降低蒙脱土对PCE的吸附量，使得蒙脱土表面变得更加光滑，且空隙更小；JJA KNJ溶于水后，吸附在蒙脱土颗粒的表面上，形成一层有机阳离子聚合物保护膜，阻止PCE的侧链进入蒙脱土的层间；JJA KNJ在水泥水化的碱性条件下对蒙脱土颗粒具有明显的稳定效果，而且这一效果不会随着时间的延长出现明显衰减. |
| 关键词: 聚羧酸减水剂 蒙脱土 净浆 抗泥剂 机理 |
| DOI：103969/j.issn.1007 9629201704011 |
| 分类号: |
| 基金项目: |
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| Improvement of Adaptability of Polycarboxylate Superplasticizer to Montmorillonite by Anti clay Agent and Its Mechanism |
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WANG Fanggang, LU Jiayue, LIU Jianzhong, SHA Jianfang, ZHAO Shuang
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Jiangsu Sobute New Materials Co.,Ltd., Nanjing 211103, China
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| Abstract: |
| 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. |
| Key words: polycarboxylate superplasticizer montmorillonite(MMT) paste anti clay agent mechanism |
