Abstract
The influence of styrene-butadiene rubber ( sbr) and acrylic latices on the properties of Portland cement concrete is investigated. Properties of modified concretes are compared with unmodified samples, on the basis of constant water cement ratio, and on the basis of constant workability. In samples with constant water cement ratio, reduction of compressive strength in polymer-modified concretes is statistically significant, and some improvements in flexural and tensile strengths are observed. Scanning electron microscopic examination of the sbr latex modified concrete, using a heavy element tagging technique and energy dispersive analysis of X-rays, demonstrates a non-uniform distribution of polymer modifier in the cement matrix at higher concentrations.
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