The Effect of Bottom Ash as Partial Replacement of Fine Aggregate in Different NaOH Molarities on the Compressive Strength of Geopolymer MortarRatni Nurwidayati, Intan Saniah, Nursiah Chairunnisa and Ade Yuniati PratiwiE3S Web Conf., 476 (2024) 01031DOI: https://doi.org/10.1051/e3sconf/202447601031