Material Properties of Porous Concrete Using Recycled Coarse Aggregates

Abstract

This paper presents the properties of porous concrete with different amounts of recycled coarse aggregate (RCA) obtained from a demolished building and comparing the results with normal porous concrete containing 100% natural coarse aggregate (NCA). The RCA that was used is crushed clay brick (CCB), which was partially replacing NCA by an amount of 25, 50 and 75%. Laboratory testing was carried out to identify the physical and mechanical properties of the respected concrete. Slump test was studied at fresh state, whereas compressive strength test and water absorption test was studied at hardened test. The experimental results indicate that the compressive strength for the porous concrete using RCA with CCB is less than the porous concrete using 100% NCA. The strength of porous concrete decreases with an increase in RCA replacement ratios. On the contrary, the percentage of water absorption of porous concrete increases as the RCA replacement ratios is increased. The present study recommends porous concrete marginally achieves the required compressive strength up 25% replacement of RCA for the CCB.