Effect of ageing time on properties of hot-mix asphalt containing recycled concrete aggregates

This study describes a laboratory evaluation on the effect of ageing time on the primary properties of hot-mix asphalt (HMA) containing recycled concrete aggregates (RCA) from construction and demolition waste (CDW). The mixtures were left in an oven for 0 h, 2 h and 4 h at the mixing temperature prior to compaction. The volumetric properties, stiffness and resistance to the permanent deformation of HMA containing 0%, 5%, 10%, 20% and 30% RCA instead of natural aggregate were studied. The results showed that increasing the ageing time of HMA containing RCA increased the number of air voids, the stiffness at ambient temperature and the initial permanent deformation.