The Effect of pH on Physico-Mechanical Properties of Cement Pastes Containing Poly (Acrylate) Latexes -Chemical Admixtures

Content Provider	Semantic Scholar
Author	Negim, El-Sayed Sakhy, M. Shilibekov, Senbek Jakiyayev, Bauyrzhan
Copyright Year	2014
Abstract	3 Abstract: 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-bis- isobutyro-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. observed and may be used as guidelines for the selection investigated. The results showed that the addition of polymers as dispersants. Negim et al. (4-6) prepared ofwater mixed to the cement with copolymer improves copolymer latexes based on 2-hydroxy ethyl acrylate most of thespecific characteristics of PC. The present (2-HEA) with each of styrene (2-HEA/St), 2-hydroxy ethyl work was designed to study the preparation and methacrylate (2-HEA/2-HEMA) and vinyl ether of characterization of P(2-HEA-co-BuA) via H NMR, FT- ethylene glycol (2-HEA/VEEG). The effect of copolymer IR, DSC and GPC. The work was further extended to latexes with and without sodium hydroxide on include the application of the obtained copolymer latexes physico-mechanical properties of PC pastes were studied. to modify the properties of PC pastes. improved the most of the specific characteisitic of PC.
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Language	English
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Content Type	Text
Resource Type	Article