Effecting of Steel Fibers and Fly Ash on the Properties of Concrete. Tikrit Journal of Engineering Sciences, [S. l.], v. 25, n. 4, p. 30–36, 2018. DOI: 10.25130/tjes.25.4.06. Disponível em: https://www.tj-es.com/ojs/index.php/tjes/article/view/96.. Acesso em: 11 sep. 2026.