Recycled construction aggregates are engineered granular materials produced by crushing, screening, and processing debris from construction, renovation, and demolition (C&D) activities. The primary sources are concrete, asphalt, bricks, tiles, and uncontaminated masonry, which are processed in specialized recycling plants to remove impurities like wood, metal, and plastic. The resulting products—recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP)—are graded to specific sizes, similar to virgin aggregates like gravel and crushed stone. This process diverts massive volumes of waste from landfills and reduces the need for quarrying natural resources, addressing two critical environmental challenges simultaneously. Key technical standards, such as those from ASTM International, govern their properties to ensure reliable performance in engineered applications.
The applications for recycled aggregates are extensive and structured by quality grades. High-quality, well-processed RCA is approved for use as a partial or full replacement for virgin aggregate in new concrete production (for non-structural elements like curbs,…