Hijriah, Akbar F, Depari AS, Ghesit MS. Flexural Strength Characteristics of Composite Concrete Based on Pet Fiber and Fly Ash. ISMATECH [Internet]. 2026 Sep. 9 [cited 2026 Sep. 12];4(2). Available from: https://journal.itk.ac.id/index.php/ismatech/article/view/8482267