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심종성 ( Sim¸ Jongsung ),박철우 ( Park¸ Choelwoo ),박성재 ( Park¸ Sungjae ),강태성 ( Kang¸ Taesung ),박성은 ( Park¸ Seongeun ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This study investigated fundamental properties of the recycled aggregate which was produced through recent hi-techniques of recycling. In addition, the mechanical properties of the concrete that used the recycled aggregate were compared th the concrete use the natural aggregate. The primary objective of this study was to characterize the concrete-rebar bonding properties of the recycled aggregate concrete. From the results of the mechanical property tests, as the recycled aggregate replacement ratio increased, the compressive strength and elastic modulus decreased. The recycled aggregate concrete showed about 18% decreased bond strength comparing to the concrete that had the same strength and used only the natural aggregate. The current bond strength prediction equation suggested by the design specification does not consider this decreased bong strength by the use of the recycled aggregate. Therefore, this study suggests a bond strength prediction equation for the recycled aggregate replacement ratio and consequent compressive strength reduction.