Umoh, A. A., & Olusola, K. O. (2012). Compressive Strength and Static Modulus of Elasticity of Periwinkle Shell Ash Blended Cement Concrete. International Journal of Sustainable Construction Engineering and Technology, 3(2), 45-55. Retrieved from https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/441