COMPARISON ON THE STATIC MODULUS OF ELASTICITY OF M50 GRADE CONCRETE USING METAKAOLIN AND POLYPROPYLENE FIBERS. International Journal of Engineering and Science Research, [S. l.], v. 14, n. 2, p. 121–131, 2024. Disponível em: https://www.ijesr.org/index.php/ijesr/article/view/915. Acesso em: 3 aug. 2025.