Folagbade, Samuel Olufemi. 2017. “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 (2): 46-56. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/1495.