Abstract
The construction community has now taken up the challenge for the use of ‘green and recycled by-products’ in construction. The utilization of coal bottom ash (CBA) in concrete is one of the feasible options to reduce the environmental problems related to its disposal. Coal bottom ash has the potential to use as a replacement of fine natural aggregates (FNA) or Portland cement (PC) and sometimes both. The current study assess the performance of self-compacting concrete (SCC) made with coarse recycled concrete aggregates (RCA) and CBA using ultrasonic pulse velocity (UPV) tests at different curing ages. Compressive strength and workability tests have also been conducted for reference. It has been noticed that with the incorporation of RCA (0, 25, 75, and 100%) and CBA (10%), the UPV values have been decreased compared to control SCC mix, however, an equivalent performance has been achieved up to 50% replacement of RCA across all curing periods. The maximum reduction up to 4 and 18% in terms of UPV and compressive strength, respectively, for SCC made with full replacement level (100%) of coarse natural aggregates (CNA) with RCA along with CBA (10%) has been noticed. However, the best and equivalent performance has been noticed for 25 and 50% replacement levels compared to control SCC mix.
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