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RESEARCH ARTICLE

Experimental Research on the Wettability of Recycled Aggregate Concrete with Fly Ash

The Open Civil Engineering Journal 15 Nov 2013 RESEARCH ARTICLE DOI: 10.2174/1874149520130927008

Abstract

Material adsorption, the reverse process of evaporation diffusion, directly reflects the wettability of materials. Wettability is one of the main factors that affect the drying shrinkage of materials. A device that measures the wettability of recycled aggregate concrete (RAC) with fly ash is proposed in this study based on pore structure theory. The isothermal absorption curve of RAC is examined with different fly ash contents. Results show that as the recycled aggregate replacement rate increases, the moisture absorption capacity of RAC gradually increases. The addition of fly ash improves the porosity of RAC structures and reduces material wettability.

Keywords: Recycled aggregate concrete, wettability, fly ash, drying shrinkage, experimental research.
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