Strength characteristic and life cycle cost of sustainable bio-patch repair geopolymer mortar using rice husk ash as an alternative silica and alumina sourcePinta Astuti, Muhammad Sakti Isnaini, Sachio Dwi Ammar and Adhitya Yoga PurnamaBIO Web Conf., 144 (2024) 06003DOI: https://doi.org/10.1051/bioconf/202414406003