Martiana R, Liza SA, Wani C, Hilmayati S, Astuti AP, ’Ardhuha J. The Effect of Adding Ketapang Fruit Ash on the Physical and Mechanical Properties of Geopolymer Concrete Based on High-Calcium Fly Ash Type C with Alkali Activator. J. Pendidik. Fis. Teknol. [Internet]. 2024 Dec. 31 [cited 2025 Apr. 17];10(2):545-50. Available from: http://jurnalfkip.unram.ac.id/index.php/JPFT/article/view/8290