A study on a technology for producing high quality recycled coarse aggregate

Abstract

60-70% of the concrete lump produced from demolished structures is presently crushed and reused for subbase course of roads, and the rest is discarded. The amount of the demolished concrete is estimated to be 3 to 5 times of the present amount in next decade. The reuse for subbase course will be difficult and recycling of concrete from structure to structure is necessary. In this paper, outline of a technology developed to produce high quality recycled aggregate that satisfy the quality required in JIS A 5005 (crushed stone) and JASS 5 (gravel) is presented. Properties of the concrete using the aggregate were shown to have the same quality as that made by natural aggregates such as gravel and crushed stone.