Evaluation of Geopolymer Concrete Based on Fly Ash Containing Steel Fibers and Rubber Crumbs Using Cement as a Partial Substitute for Fly Ash. jcer [Internet]. 2024 Mar. 28 [cited 2025 Sep. 5];6(1):22-34. Available from: http://www.journals-researchers.com/ojs/index.php/jcer/article/view/116