N. S. Ghadzali, M. H. . Wan Ibrahim, S. S. . Mohd Zuki, M. S. Hisyam Sani, and M. Y. Mohammed Al-Fasih, “Material Characterization and Optimum Usage of Coal Bottom Ash (CBA) as Sand Replacement against Concrete Properties”, ijie, vol. 12, no. 9, pp. 9–17, Dec. 2020, Accessed: Jul. 18, 2024. [Online]. Available: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5433