HARAHAP, M. H.; PUTRI, A. E. 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, Bangkok, Thailand, v. 30, n. 4, p. 79-83, 2020. Disponível em: http://jmmm.material.chula.ac.th/index.php/jmmm/article/view/765. Acesso em: 26 jan. 2021.