BEHAVIOR OF RECYCLED AGGREGATE REINFORCED CONCRETE COMPOSITE ONE WAY PRE-SLABS

The behavior of sixteen reinforced concrete composite one way simply supported pre slabs and four monolithic reinforced concrete one way simply supported slabs were studied to investigate the behavior of recycled aggregate reinforced concrete composite concrete pre slabs. The main parameters of this study were the recycled course aggregate replacement ratios and the interface condition between old and new concrete layers. The used concrete was carried out with natural aggregate and with three replacement ratios 25%, 50% and 100 of recycled concrete aggregate. In this study three interface conditions between the old and new concrete surfaces were studied using roughening interfaces, roughening with epoxy interfaces and using steel dowel shear connectors. The test results showed that using steel dowels with ratio Asd/Ash of 0.1% and imbedded length 15Ø was able to reach full composite action between concrete layers for all RCA replacement ratios.