Abstract
ABSTRACT This research virus carried put to recycle the aggregates in the waste concrete. The recycled aggregates below 25 mm produced by the company I. a construction waste processing company were divided into several pans. According as the particle size was decreased, the amount of cement mortar, absorption ratio and abrasion ratio of recycled aggregate were increased. When they were heated at 200~500°C and ground by ball mill, the amount of cement mortar separated from the recycled aggregates was increased according to increase in temperature. When the aggregates such as granite and gneiss were heated above 550°C, their compressive strength was declined for α-SiO2 contained in them was transformed into β-SiO2. Thus, the waste concrete was heated at 400~500°C and ground by ball mill for 1 hr not to deteriorate the aggregate in concrete. As a result, the specific gravity, the absorption ratio, and the abrasion ratio of the aggregates become above 2.5, below 3.0%, and below 40%.
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