| 含硅烷官能团聚羧酸减水剂对水泥浆体流动性和力学性能的影响 | |
| 孔祥明 ; 刘辉 ; 蒋凌飞 ; 路振宝 ; 王栋民 ; KONG Xiangming ; LIU Hui ; JIANG Lingfei ; LU Zhenbao ; WANG Dongmin | |
| 2016-03-30 ; 2016-03-30 | |
| 关键词 | 硅烷 聚羧酸减水剂 流动性 吸附 强度 silane polycarboxylatesuperplasticizer cement adsorption strength TU528.042.2 |
| 其他题名 | Influence of Silanized Polycarboxylate Polymers on Fluidity and Strength Development of Cementitious Material |
| 中文摘要 | 用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)部分或全部取代聚羧酸减水剂合成过程中的丙烯酸(AA)单体,通过自由基聚合合成了一系列不同组成的硅烷改性聚羧酸减水剂(SPC)。研究了引入硅烷官能团后,减水剂对水泥净浆流动度的影响规律。采用总有机碳分析法(TOC)研究了硅烷改性聚羧酸减水剂的吸附行为。最后评价了其对水泥砂浆强度发展的影响。结果表明:聚羧酸减水剂(PC)分子中羧基含量越高,其在水泥颗粒表面的吸附量越大,对水泥浆体的分散性越好;在减水剂分子结构中引入硅氧烷官能团,水解生成的硅羟基可以作为吸附基团,提高减水剂分子在水泥颗粒表面的吸附能力,从而提高减水剂对水泥的分散能力;且硅羟基在水泥表面的吸附为化学吸附,因此其吸附能力大于羧基官能团(—COOH);聚异丁烯醇聚氧乙烯醚和KH570的摩尔比为1∶1或1∶2的共聚物有利于砂浆7、28d抗压强度的发展。; A series ofγ-methacryloxypropyltrimethoxysilane(KH570)modified superplasticizers(SPC)were synthesized through radical copolymerizationin aqueous phase,in which acrylic acid(AA)was completely or partially replaced by the KH570.The dispersive property and adsorption of the SPC were analyzed viaflow table test and total organic carbon(TOC) measurement.In addition,the influence of the SPC on the strength development of cement mortars was also investigated.The results show that there are more carboxyl groups in polycarboxylate(PC)molecules,leading to a greater adsorption amount on cement surface and a higher dispersing capability in cement pastes.The incorporation of silanolgroups in polycarboxylate chains that is produced by the hydrolysis of siloxane group promotes the adsorption of superplasticizer molecules on cement surface. The adsorption of silanol groups on cement surface is chemical adsorption viathe condensation to form Si—O—Si covalent with cement surface,which is stronger than the physical adsorption of the carboxyl groups(—COO--).The copolymerization of silane monomers in polycarboxylate molecules increases the adsorption amount of the polymers,hence enhancing the dispersive performance.The positive strength development of mortars after 7-d and 28-d curing can be obtained when the mole ratios of monomers(methallylpolyoxethylene ether to KH570)are 1∶1and 1∶2,respectively. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/148933]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 孔祥明,刘辉,蒋凌飞,等. 含硅烷官能团聚羧酸减水剂对水泥浆体流动性和力学性能的影响[J],2016, 2016. |
| APA | 孔祥明.,刘辉.,蒋凌飞.,路振宝.,王栋民.,...&WANG Dongmin.(2016).含硅烷官能团聚羧酸减水剂对水泥浆体流动性和力学性能的影响.. |
| MLA | 孔祥明,et al."含硅烷官能团聚羧酸减水剂对水泥浆体流动性和力学性能的影响".(2016). |
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