Effect of SBR and XSBRL on water demand, mechanical strength and microstructure of cement paste

Abstract

This paper aims to disclose the properties and mechanism of latex-modified cement materials. Two kinds of latexes were selected, SBR and XSBRL, to prepare the modified materials. Grouting materials containing different latexes and proportioned for varying water-to-cement ratios were investigated, and testing was made under four different curing conditions. Test results had shown that the latexes significantly reduced the water demand and changed the setting time. The improvement of mechanical properties was related to the type of latex, curing condition, and dosage. The addition of 5% latex positively influenced reducing the porosity and restraining the chloride ion penetration. SEM and EDS analysis show that the properties of the polymer-modified mortars were influenced by the polymer film, cement hydration products, and the chemical reaction between the organic and inorganic phases.