Abstract
This study proposes a novel method of recycling concrete waste by compaction. The advantages of the proposed method are its high production speed and its complete recycling, as we use the aggregate and the cement paste matrix. First, the hardened cement paste (HCP) is examined, crushed, milled, and compacted. The formed compacts showed high strength. Compacts of hardened concrete were prepared after crushing and milling; however, their strength was low. The processes of adding HCP or sludge cakes and performing carbonation treatment were studied, and all treatments were found to be effective in increasing the strength of the compacts.
