The source of the clean aggregate is mixed and may come from tonnage received at recycle centers or sources such as foundations, curb and gutter, roads, highways, airport runways and more.
Much of our nation's transportation infrastructure now requires significant renovation and replacement. Many contractors are recycling concrete as a supplement to natural aggregates such as crushed stone, sand and gravel.
In the past decade both the American Society for Testing and Materials (ASTM) and American Association of State Highway and Transportation Officials (AASHTO) have accepted recycled concrete as a source of aggregate into new concrete and have set the quality standards. These premier specifying agencies are confident that recycled concrete aggregate can be of high quality. Now it is the aggregate producers’ responsibility to produce quality recycled concrete aggregate.