The aim of the current study was to determine the applicability of recycled concrete aggregate (RCA) in the production of concrete mixtures for vibro-pressed concrete blocks. The experiments were focused on crushed waste material from the same concrete elements in the production plant. For this type of precast elements only some finer fractions can be implemented, and the “earth-moist” consistency of fresh mixtures is required. A series of samples was prepared in which the mixture of natural aggregates was partially or totally substituted by RCA. The 0/4 RCA fraction, which is usually rejected in ready-mix concrete technology, plays the role of 0/2 sand. The substitution of the sand fraction ranged from 20% to 100%. The substitution of the coarser aggregate fractions by 4/16 RCA was also done.
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Grzegorz Łój and Wiesława Nocuń-Wczelik, AGH - University of Science and Technology, Kraków, Poland