Synthesis, characterization and working mechanism of a novel polycarboxylate superplasticizer for concrete possessing reduced viscosity
Synthesis, characterization and working mechanism of a novel polycarboxylate superplasticizer for concrete possessing reduced viscosity
复制标题
新型聚羧酸减粘混凝土高效减水剂的合成、表征及作用机理
DOI：
10.1016/j.conbuildmat.2018.02.212
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发表时间：
2018-04-30
影响因子：
7.4
通讯作者：
Guan, Jianan
中科院分区：
文献类型：
--
作者：
Qian, Shanshan;Yao, Yan;Guan, Jianan
为解决新拌混凝土特别是高标号混凝土粘度高的问题，通过分子结构的创新设计，合成了一种新型降粘型聚羧酸系高效减水剂（PCE），并对其进行了表征，证实了设计的分子结构。通过表面张力、吸附行为和Zeta电位等测试手段，探讨了掺合成PCE的水泥净浆和新拌混凝土的流变性能。根据细观力学过程模型，塑性粘度与T50和V形漏斗时间具有良好的相关性。此外，工作机制的研究有趣地表明，降低分子量和侧链长度，引入疏水基团可以实现改善的分散能力和降粘效果。本研究的目的是提供一种合成具有上级和易性和在新拌混凝土中降粘性能的PCE的有希望的途径。该新型PCE可作为混凝土工程中的降粘剂。(C)2018爱思唯尔有限公司版权所有
To solve the problem of high viscosity for fresh concrete especially high-grade concrete, a novel viscosity reducing type of polycarboxylate superplasticizer (PCE) was synthesized based on innovative design of molecular structure, and also was characterized to confirm the designed molecular structure. The rheological performances of cement paste and fresh concrete containing synthesized PCE were probed, which were analyzed by means of surface tension, adsorption behavior and zeta potential. The plastic viscosity showed a good correlation with T50 and V-funnel time according to mesomechanics process model. Moreover, the investigation of working mechanism interestingly showed that lowering molecular weight and side chain length and introducing hydrophobic groups can achieve improved dispersion capacity and viscosity-reduction effectiveness. The aim of this study is to provide a promising avenue to synthesize PCE with superior workability and viscosity-reducing performance in fresh concrete. This new type of PCE can be used as a viscosity-reducing agent in concrete engineering. (C) 2018 Elsevier Ltd. All rights reserved.