Integrated interface parameters of recycled aggregate concrete

Abstract An integrated interface parameter of recycled aggregate concrete (RC), ξ, is proposed, based on experimental study of three RC groups with the recycled coarse aggregate (RA) replacements of 0%, 50% and 100%, respectively. Experimental study includes micro properties of diverse types of aggregate/mortar interfaces in RC, i.e., the length, width, and elastic modulus, and the macro properties of concrete materials, i.e., the compressive strength, density degree and chloride ion diffusion coefficient. The rationality of the proposed ξ is proven by the comprehensive relevant interface information and its good correlations with both RA replacement ratios and concrete macro properties, respectively. ξ-based model prediction of macro concrete properties was also found reliable. The mechanism of RC’s inferiority to natural aggregate concrete can thereby be quantitatively revealed based on ξ.

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