B. Ajitha, H. Sudarsana Rao. “Rapid Chloride Permeability Studies on High Strength Concrete With Nano Al2o3 and Silica Fume”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, Apr. 2020, pp. 3449 -60, http://sersc.org/journals/index.php/IJAST/article/view/12037.