The experimental compressive strength of normal and self-compacting concrete with recycled coarse aggregate

Self-Compacting Concrete (SCC) is an innovation in the technology of making concrete that does not require a compaction process to fill the formwork. In this study, recycled coarse aggregate (RCA) was used as constituent material in both normal and SCC concrete. The aggregate was obtained from ready mix concrete waste with the quality of K300-K350, which was crushed into a size of 5-10 mm (25%) and 10-20 mm (75%). Concrete was cast into concrete cylinders, size of 15x30 cm then treated and tested at 28 days. In SCC concrete, superplasticizer is used, but fly ash was not used in the concrete mixture. The compressive test results show that normal concrete has a higher compressive strength than self-compacted concrete. This is due to the high amount of coarse aggregate that used in normal concrete. The results are almost corresponding with modulus of elasticity.