期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 47, 期 -, 页码 1381-1394出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.06.016
关键词
Polymer modified mortar; Microstructure; Mechanism of polymer modification; Polymer latex; Surfactant
资金
- National Natural Science Foundation of China [NSFC 51008272, 51178413]
- National High Technology Research and Development Program of China [2012AA050903]
- Research Fund for the Doctoral Program of Higher Education of China [20100101120061]
The microstructure forming process of polyacrylate (PA) latex modified cement-based materials was investigated from mixing to hardening. Owing to the chemical reaction between PA particles and calcium ions in the pore solution, PA polymer will not uniformly disperse in cement mortar due to its adsorption on cement particles or hydrates. As a result, PA polymer should exist in cement mortars through different morphologies. The early age mechanical properties of PA modified mortars are lower than those of unmodified mortars, while a rapid progress of the compressive strength and fracture energy can be recognized from the PA modified mortars. It was found that PA polymer addition will refine the small pores but induce big pores to cement mortar. SEM and EDX analysis proves that PA polymer is localized at some places within PA modified mortar which can be named as the localization of polymer modification. The physical and chemical influence of PA polymer on cement-based materials was integrated into an improved model. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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