Choi Won-Chang, Jung Kwon-Young, Jang Seok-Joon, Yun Hyun-Do
Department of Architectural Engineering, Gachon University, Gyeonggi-do 461-701, Korea.
Korea Land & Housing Corporation, Gyeongsangnam-do 52852, Korea.
Materials (Basel). 2019 Jun 30;12(13):2105. doi: 10.3390/ma12132105.
Steel fiber embedded in concrete serves to reduce crack development and prevent crack growth at the macroscopic level of the concrete matrix. Steel fiber-reinforced concrete (SFRC) with high compressive concrete strength is affected primarily by the dimensions, shape, content, aspect ratio, and tensile strength of the embedded steel fiber. In this study, double-ended hook steel fiber was used in SFRC with a concrete compressive strength of 80 MPa. This fiber was used for the study variables with two aspect ratios (64, 80) and tensile strength values up to 1600 MPa. The flexural performance of the SFRC specimens was evaluated using crack mouth open displacement tests, and the test results were compared with code provisions. A modified reinforcement index was also used to quantify the flexural performance based on comparisons with fracture energy.
嵌入混凝土中的钢纤维有助于在混凝土基体的宏观层面减少裂缝发展并防止裂缝扩展。具有高混凝土抗压强度的钢纤维增强混凝土（SFRC）主要受嵌入钢纤维的尺寸、形状、含量、长径比和抗拉强度的影响。在本研究中，双端钩钢纤维被用于混凝土抗压强度为80 MPa的SFRC中。该纤维用于具有两个长径比（64、80）和高达1600 MPa抗拉强度值的研究变量。使用裂缝口张开位移试验评估了SFRC试件的弯曲性能，并将试验结果与规范规定进行了比较。还使用了修正的配筋指数，通过与断裂能的比较来量化弯曲性能。
