Wan Ibrahim, M. H. ., Ali Mangi , S., & Juki, M. I. . (2020). Effects of Coal Bottom Ash as Cementitious Material on Compressive Strength and Chloride Permeability of Concrete . International Journal of Sustainable Construction Engineering and Technology, 11(2), 1-12. https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/6777