“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): 10-18. https://doi.org/10.31695/IJERAT.2021.3709.