Microstructural Aspects of SBR Latez-Modified Cement Paste and Mortar Highlighted by Means of SEM and ESEM
Styrene-butadiene rubber (SBR) latex modified cement mortars were prepared with varying polymer/cement-ratios (mp/mc) and a constant water/cement-ratio of 0.40. The influence of the SBR latex on cement hydration products in cement pastes is investigated using environment scanning electron microscopy (ESEM), the effect of the SBR latex on the polymer-cement hydration products comatrix structures and the interface structures in cement mortar is also studied by scanning electron microscope (SEM). The results show that the SBR latex facilitates the formation and the stability of AFt in cement paste, delays the formation of C-S-H gel and Ca(OH)2, but up to 3d the structure of the SBR latex-modified cement paste has no significant difference with that of control cement paste. Perfect mesh network polymer films are formed in SBR latex-modified mortars at the mp/mc of 8％. The polymer films are formed by the accumulation of polymer particles, and thin polymer films are observed at a hydration time of 2d. With hydration, the formed polymer films are penetrated by gradually growing cement hydration products. As a result, the organic-inorganic interpenetrating structures are formed in SBR latex-modified mortars by two types of successive phases of mesh network polymer films and cement paste. The weak structure at the interfaces of the aggregates and cement paste is modified by the SBR latex effectively.
SBR latez polymer-modified cement paste polymer-modified cement mortar microstructure SEM ESEM
Ru Wang Peiming Wang
Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
国际会议
6th Asian Symposium on Polymers in Concrete(第六届亚洲聚合物混凝土国际会议)
上海
英文
289-298
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）