“Utilization of Rice Husk Ash and Waste Foundry Sand As Partial Replacement for Cement and Fine Aggregate in Concrete”. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) , vol. 4, no. 8, Aug. 2018, pp. 47-55, https://doi.org/10.31695/IJERAT.2018.3312.