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硅烷改性聚羧酸减水剂对水泥浆体流动性及水化进程的影响
作者:何燕1 2 张雄1 2 顾明东1 2 洪万领1 2 
单位:1. 同济大学材料科学与工程学院 上海 201804 2. 同济大学 先进土木工程材料教育部重点实验室 上海 201804 
关键词:硅烷改性 聚羧酸减水剂 分散性 水化放热 水化程度 
分类号:TQ172.4+6
出版年,卷(期):页码:2016,44(8):1166-1172
DOI:10.14062/j.issn.0454-5648.2016.08.13
摘要:

通过自由基聚合法,利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)部分或完全取代聚羧酸减水剂合成过程中的丙烯酸(AA)单体,合成了硅烷改性聚羧酸减水剂。研究了硅烷改性聚羧酸减水剂在水泥颗粒表面的吸附行为以及对水泥浆体分散性能的影响,并研究了硅烷改性聚羧酸减水剂对水泥水化进程的影响。结果表明:硅烷部分取代丙烯酸可提高聚羧酸减水剂在水泥颗粒表面的吸附量,提高了水泥浆体流动度;相对于传统聚羧酸减水剂,可更大程度延缓水泥水化进程,但可提高水泥3 d水化程度;而硅烷全部取代丙烯酸,聚羧酸减水剂对水泥吸附、分散性能下降,对水泥水化延缓程度增强,对水泥水化程度无提高效果。
 

A series of organosilane-modified polycarboxylate superplasticizers were synthesized via the radical polymerization in aqueous solution, in which acylic acid (AA) was partially or completely substituted by 3-(trimethoxysilyl) propyl methacrylate. This work mainly investigated the adsorption, dispersing performance of these polymers and their effect on cement hydration. The results show that partially-silylated polycarboxylates exhibit higher adsorption amount than reference polycarboxylate, while fully-silylated polycarboxylate shows a reduced adsorption amount. Partially-silylated polycarboxylate can improve the dispersing properties of cement paste, but the addition of excessive amount results in the decrease of fluidity. The flow retainability of partially-silylated polycarboxylates is lower than that of reference polycarboxylate, and the viscosity and the yield stress increase more steeply. Although partially-silylated polycarboxylate leads to a prolonged induction period, after the induction period, the accelerated hydration degree at 3 d occurs by adding partially-silylated polycarboxylate into cement paste. The fully-silylated polycarboxylate results in the enhanced prolonging induction period without acceleration in hydration degree at 3 d or 28 d hydration ages.

 

基金项目:
国家自然科学基金项目(51378391);“十二五”国家科技支撑计划项目(2011BAE27B04)。
作者简介:
何 燕(1987—),女,博士研究生。
参考文献:

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