The Effect of Sodium Silicate to NaOH Ratio on Strength Development of Fly Ash Geopolymer Mortar in Marine EnvironmentArie Wardhono, Yogie Risdianto, Bambang Sabariman, Ninik Wahju Hidajati and Nur AndajaniE3S Web Conf., 445 (2023) 01005DOI: https://doi.org/10.1051/e3sconf/202344501005