International Journal of Engineering and Technology

Performance of black stone waste (BSW) as a substitute for natural coarse aggregate in concrete production has been studied concerning the unit weight, compressive strength and splitting tensile strength. The concrete mixtures were designed using a weight ratio of 1 Portland Pozzolan cement: 2 fine aggregate: 3 coarse aggregate and water cement ratio of 0.5. Five concrete mixtures were made by replacing natural coarse aggregate in concrete mixtures with BSW of 0%, 25%, 50%, 75%, and 100%. For each mixture 10 specimens were made: 5 cube specimens measuring 150x150x150 mm for compressive strength test and 5 cylindrical specimens with a diameter of 150 mm and 300 mm high for splitting tensile strength test. For measurement of unit weight, the two types of specimens were used. The result shows that the unit weight of concrete made with BSW is about 3%-7% lighter than that of concrete made with natural coarse aggregate. Concrete made with certain quantity of BSW can produce both compressive strength and splitting tensile strength higher than concrete made with natural coarse aggregate. The compressive strength and splitting tensile strength of concrete made with 100% BSW can respectively reach about 88% and 104% of that of concrete made with natural coarse aggregate.