Enhancing the Strength Characteristics of Concrete Using Polypropylene Fiber and Steel Fiber in Combination as Partial Replacement of Fine Aggregates . IJIREM [Internet]. 2022 Apr. 30 [cited 2024 Dec. 26];9(2):608-12. Available from: https://acspublisher.com/journals/index.php/ijirem/article/view/11180