The purpose of this study was to investigate whether demolished concrete can be used as an alternative for natural coarse aggregates in concrete. Specifically, this study wished to measure the strength of relationship between recycled concrete volume in concrete and its flexural strength. Also, this investigation determined whether there is a significant difference in flexural strength between concrete with recycled concrete and that with gravel as coarse aggregates.
Experimental design was the method implemented and this involved four sets of different mixtures with three samples for each mixture. The first set of mixture used gravel as coarse aggregates and in other three sets of mixture-50%, 75% and 100% of the natural coarse aggregates was replaced with recycled concrete aggregates. These samples were tested for flexural strength.
Findings of the study indicated that as the volume of the recycled concrete aggregates in concrete increases, its flexural strength decreases. Also, the flexural strength of concrete with recycled concrete as coarse aggregate is comparable to the flexural strength of concrete with gravel as coarse aggregates.