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An investigation on the microstructure formation of polymer modified mortars in the presence of polyacrylate latex



Title: An investigation on the microstructure formation of polymer modified mortars in the presence of polyacrylate latex
Author(s): Ye TIAN, Zong-jin LI, Hong-yan MA, Xian-yu JIN, Nan-guo JIN
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 71 - 77
Total Pages: 8
Nb references: 14
Language: English


Abstract: In this research, the microstructure formation of polyacrylate (PA) latex modified mortars was investigated from mixing to hardening. The polymer film forming process was studied, with specific emphasis on the chemical and physical reactions between polymer and cement hydration products. An improved four-step model was proposed for representing the mechanism of polymer modification in view of the reactivity of polymer latex in cement-based materials. And the influence of PA latex on the microstructure formation of mortars was revealed through the analysis of pore structure and polymer distribution. Owing to cement hydration, the uniform dispersion of polyacrylate polymer in fresh mortar will be destructed, and polymer particles will deposit and flocculate into big groups at some local positions. The modification of polyacrylate polymer on cement-based materials is localized which can be stated as the localization of polymer modification. The addition of PA latex will also introduce some air voids into mortars due to the chemical reaction between its surfactant and cement hydrates. This is important for the physical and mechanical properties improvement because a kind of purposefully designed polymer latex will effectively enhance the performance of cement-based materials in a relative small dosage, which means cutting the cost down and broadening its application.


Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00


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