Classification and Production of Recycled Concrete Aggregates
Classification and Production of Recycled Concrete Aggregates Based on Concrete
Completion Date: June 2022
Funding Agency: U.S. Army Corps of Engineers
Project Abstract: Recycled concrete aggregates (RCA) are produced by crushing hardened concrete. The purpose of this study is to determine the mechanical and durability properties of concrete with 100% recycled concrete coarse aggregates and relate the mechanical and durability of new concrete to the physical, mechanical, and durability properties of RCA and the RCA parent concrete. Parent concrete containing dolomite, granite, or limestone natural aggregates mixed with water-to-cement ratios of 0.38 or 0.48 were crushed to create control RCA. In addition, commercially available RCAs (unknown parent concrete(s)) were collected from around the USA. The 28-day compressive strength of concrete made with RCA is influenced by the water-to-cement ratio of the new concrete, the nominal maximum aggregate size, specific gravity, and dry-rodded unit weight of the RCA, and the fresh concrete mixture temperature and slump.