Utilization of Calcium Carbide Residue and Bottom Ash as a Binder for Making Concrete Paving Block

This article aims to utilize industrial waste materials for producing concrete paving block, which are calcium carbide residue (CR) mixed with bottom ash (BA) as a binder. Fine recycled concrete aggregate (FRCA) was used entirely as a substitute for sand. This study was divided into 2 groups. First, the ratios at 50:50, 40:60, 30:70 and 20:80 wt% with a casting pressure of 8 MPa were used to determine the optimum ratio. Secondly, sodium hydroxide (NaOH) was used as an activator for the binder at a concentration of 6 molar in the mixture with the optimum ratio. The concrete paving block specimen having a dimension of 100×200×60 mm3 (W×L×H) was used in this study. The results showed that CR:BA of 70:30 by weight gave a compressive strength of 27.6 MPa at 28 days and increased to 38.3 MPa at 90 days. However, the concrete with 6 M (NaOH)solution produced the highest compressive strength of 33.4 MPa at 28 days in all groups of studies.