Folagbade, Samuel Olufemi. “Initial Surface Absorption of Cement Combination Concretes Containing Portland Cement, Fly Ash, Silica Fume and Metakaolin”. International Journal of Sustainable Construction Engineering and Technology 8, no. 2 (December 13, 2017): 46–56. Accessed May 4, 2024. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/1495.