Ghadzali, Nor Syafiqah, Mohd Haziman Wan Ibrahim, Sharifah Salwa Mohd Zuki, Mohd Syahrul Hisyam Sani, and Mohammed Yahya Mohammed Al-Fasih. 2020. “Material Characterization and Optimum Usage of Coal Bottom Ash (CBA) As Sand Replacement Against Concrete Properties”. International Journal of Integrated Engineering 12 (9): 9-17. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5433.