The quality and quantity of the residual mortar greatly influence the quality of the recycled coarse aggregate and change with the mix proportion of the original concrete. In this study, an experimental examination was performed focusing on the water binder ratio and the fine aggregate content of the original concrete that influence the quality of recycled coarse aggregate and recycled aggregate concrete. As a result, it was found that the quality of the recycled coarse aggregate containing the residual mortar of the original concrete is almost equal to that of the original aggregate when the water binder ratio and the fine aggregate content of the original concrete are low.
