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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