Effect of the Addition of Natural Fibers on the Mechanical Properties of Concrete Andi Yusra, Teuku Budi Aulia, Muttaqin Hasan, Meidia Refiyanni, Zakia Zakia, Fachruddin Fachruddin and Indah Damayanti E3S Web Conf., 476 (2024) 01027 Published online: 17 January 2024 DOI: 10.1051/e3sconf/202447601027