Study and improvement the effect of internal sulphate on properties of normal and light weight concrete. Periodicals of Engineering and Natural Sciences, [S. l.], v. 8, n. 3, p. 1817–1828, 2020. DOI: 10.21533/pen.v8.i3.1215. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/1215. Acesso em: 3 jun. 2026.