Utilization of styrene copolymer lattices (DBSS/PVA) as chemical admixture for mortar

Abstract

The physical and mechanical properties of mortar containing copolymer lattices as chemical admixtures were investigated. Copolymer lattices used based on styrene and butyl acrylate were prepared in presence of potassium persulfate/sodium metabisulfite (KPS/NaMBS) as redox initiation system and a coemulsifier that consists of dodecyl benzene sodium sulfonate and polyvinyl alcohol (DBSS/ PVA). The results showed that the addition of copolymer lattices to mortar improves the physical and chemical properties of mortar. However, as the dosage of lattices increases, W/C ratio as well as workability increases while compressive strength and chemically combined water content decrease.

Utilization of styrene copolymer lattices (DBSS/POE) as chemical admixture for mortar

“…However, workability increased with increasing dosage of lattices. As expected, and in agreement with previously reported results by authors [30][31][32][33][34], workability increases with increasing dosage of lattices. in addition, the use of anionic surfactant in the preparation of lattices is highly detrimental to the workability of mortars and concretes.…”

“…In our laboratory, it is of particular interest to study the effect of polymers on the physico-mechanical properties of cement, mortar and concrete. Our previous work reported the copolymer latexes based on molar ratio of 2-hydroxy ethyl acrylate and 2-hydroxy ethylmethacrylate [31], acrylic acid and butymethacrylate [32], 2-hydroxy ethyl acrylate and 2-hydroxymethacrylic acid [33], and styrene and methacrylate [34,35]. The results indicate that the latexes cause improvement in mortar properties compared with control samples without latexes.…”

“…W/C ratio of mortars depends on many factors, such as type monomers, surfactants, type and dosage of lattices [5,9,22]. Furthermore, the W/C ratio of mortar mixed with St/ BuA lattices in presence of DBSS/POE is lower than those premixed with St/ BuA lattices in presence of DBSS/ PVA [34].…”

“…The decrease in water absorption is due to the formation of new linkage inside the pore structure of the hardened cement as in the study reported in Refs. [30][31][32][33][34][35]. …”

Utilization of copolymer based on poly (vinyl alcohol) and 2-ethylhexyl acrylate as admixture for cement pastes

“…Styrene/methacrylate copolymer has been prepared by emulsion polymerization in presence of PVA as surfactant. The obtained polymer was mixed with cement to study physical and mechanical properties of cement pastes and mortars [6,7]. The results showed that the emulsion copolymers in presence of PVA obviously improved most of the specific characteristics of the cement pastes [6].…”