Wardhono, Arie, Mochamad Firmansyah Sofianto, and Meity Wulandari. 2025. “Investigation on the Effect of Natural Kaolin Substitution on Geopolymer Mortar Made by a Combination of Fly Ash and Rice Husk Ash”. Edelweiss Applied Science and Technology 9 (3):1077-87. https://doi.org/10.55214/25768484.v9i3.5420.