“Characteristics of M30 Grade Concrete using Copper Slag as Partial Replacement for River Sand as Fine Aggregate” (2021) International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT, 7(5), pp. 10–18. doi:10.31695/IJERAT.2021.3709.