The effect of terpolymer admixtures on physico-mechanical properties of cement pastes (original) (raw)

2014, International Journal of Basic and Applied Sciences

Copolymer solution latexes based on 2-hydroxy ethyl acrylate (2-HEA) with butylacrylate (BuA) P[2-HEA-co-BuA], were synthesized with different composition ratios [(99: 01), (97: 03), (95: 05)] using azo-bisisobutyro-nitrile (ABIN) as free radical initiation system. The obtained latexes were characterized by H NMR, 1 FT-IR, DSC and GPC. The results showed that the molecular weight of latexes increase with increasing ratio of BuA in the copolymer. The effect of copolymer latexes in presence of NaOH on properties of Portland cement (PC) was studied. Various formulations were designed to investigate the effects ofprocess variables such as composition ratio of monomers and pH on the physico-mechanicalproperties of PC. The water of consistency decreased with latexes addition, whereas the setting times (initialand final) increased. The compressive strength slightly increased during the early stages of hydration and sharply increased during the later stages. Adding latexes improved the workability, densityand combined water content of PC. Moreover, increasing BuA content in the composition ratio improves the properties of PC. However the increasing pH of copolymer latexes improved the properties of PC more than without pH.

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