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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):0-0
DOI:10.14062/j.issn.0454-5648.2016.08.14
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),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对水泥的吸附—分散性的影响,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,提高水泥浆体流动度;相对于传统聚羧酸减水剂,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。
 

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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 paper mainly investigated the adsorption, dispersing performance of these polymers and their effect on cement hydration. The results show that partially-silylated polycarboxylates exhibit greater adsorption amount than 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 fluid retainability of partially-silylated polycarboxylates is lower than that of polycarboxylate, and the viscosity and the yield stress increase more steeply with the time. Although partially-silylated polycarboxylate leads to a prolonged induction period, the accelerated hydration degree at 3 d occurs by partially-silylated polycarboxylate after the induction period. 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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