Purba, Luki Hariando, Bartholomeus Hutagalung, and Siwan Perangin-angin. “Experimental and Numerical Study on the Comparative Flexural Behavior of Geopolymer Concrete Beams Based on Metakaolin and Fly Ash”. INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur 21, no. 1 (June 2, 2025): 46–56. Accessed August 25, 2025. https://journal.uny.ac.id/index.php/inersia/article/view/78027.