Harahap, Mukti Hamjah, and Aulia E. Putri. “Effect of Variations in the Composition and Size of Red Sand Grains on the Quality of K-225 Concrete”. Journal of Metals, Materials and Minerals 30, no. 4 (December 22, 2020): 79–83. Accessed November 22, 2024. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/765.