Harahap MH, Putri AE. Effect of variations in the composition and size of red sand grains on the quality of K-225 concrete. J Met Mater Miner [Internet]. 2020 Dec. 22 [cited 2024 Nov. 22];30(4):79-83. Available from: https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/765