Harmaji, Andrie. “Seawater As Alkali Activator in Fly Ash Based Geopolymer”. Engineering, MAthematics and Computer Science Journal (EMACS) 4, no. 2 (June 9, 2022): 45–49. Accessed August 30, 2025. https://journal.binus.ac.id/index.php/EMACS/article/view/8322.