Use parent concrete strength and equivalent water absorption of recycled concrete aggregates to identify concrete properties

Abstract

This article focuses to study some properties of recycled aggregate concretes (RAC) according to the equivalent water absorption of aggregates and the parent concrete strength of RCA and thus new relationships were deduced. The results indicated that 1% increase of the equivalent water absorption induced 0.12% increase in superplasticiser dosages. The hyperbolic model seems to be more adequate to estimate compressive strength and shrinkage of RAC when the parent concrete strength and the equivalent water absorption were introduced. According to the obtained results, the parent concrete strength of RCA must not be less than 10 MPa than that of the reference concrete to avoid the drop in compressive strength. For high equivalent water absorption, the ultimate shrinkage became higher and slower.