Rabia Hadi Elhag, Tayeb Taher Elfarah, Salimah Ali Alareefi, Abdelhakim Alrjaibi, Saleh Ali Tweib. Study the effect of glass fibers and polypropylene fibers on the mechanical properties of concrete. sjphrt [Internet]. 2025 Nov. 28 [cited 2026 Sep. 19];1(2):54-6. Available from: https://sjphrt.com.ly/index.php/sjphrt/article/view/16