Abstract
Aerogel and porous lightweight aggregates have adverse impacts on the fresh, mechanical, and water absorption characteristics of concrete. In this study, styrene-butadiene rubber (SBR) and Paraffin were used to coat the lightweight aggregates. The lightweight aggregates were coated in single and double layers. Besides, aerogel particles were also coated with SBR. The properties of the cementitious composites, such as slump flow, T50 flow time, V-funnel flow time, J-ring height, compressive strength, water absorption, porosity, and microstructural analysis, were evaluated. It was observed that single-layer coatings of polymers on EGA improved the slump flow by 6.9% and lowered the water absorption by 26%. The compressive strength of the cementitious composites incorporating polymer coated EGA also improved by 15.9%. Scanning microscopy was used to evaluate the microstructure of EGA, aerogel, and lightweight cementitious composites. A uniform, denser structure of polymer coated EGA was observed in the interfacial transition zone.
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