Strength performance of fly ash and rice husk ash geopolymer as sustainable infrastructure green materials in supporting SDG 9 and SDG 13Arie Wardhono, David W. Law, Mochamad Firmansyah Sofianto and Meity WulandariE3S Web Conf., 568 (2024) 02003DOI: https://doi.org/10.1051/e3sconf/202456802003