2019 Volume 73 Issue 1 Pages 379-386
This study aims to establish the technology to produce recycled aggregate from waste concrete with acid solution. The determination of the optimum dissolution conditions （concentration, etc）, the evaluation of the physical property values of the regenerated coarse aggregate, and the possibility of multiple productions were considered. Physical properties （density in oven-dry condition, water absorption, fine particle amount, abrasion loss） of the regenerated coarse aggregate obtained by dissolution using a formic acid aqueous solution having a concentration of 20％ satisfy the Japanese Industrial Standards （JIS A 5021）.
