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.
• Rowan PI: Gilson Lomboy