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Title |
Flexural Behavior of Slabs Reinforced with Grid-Type CFRP Reinforcement Manufactured Using Adhesion
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Authors |
민경재(Kyoung-Jae Min) ; 김경민(Kyung-Min Kim) ; 송범근(Bhum-Keun Song) ; 박성우(Sung-Woo Park) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.2.197 |
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Keywords |
탄소그리드; 직물섬유보강콘크리트; 인장보강재; 휨거동; 탄소섬유보강재료 carbon grid; textile reinforced concrete; reinforcement; flexural behavior; carbon fiber reinforced polymer |
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Abstract |
A design and manufacturing process for grid-type carbon fiber reinforced polymer (CFRP) reinforcement (hereafter referred to as carbon grid, K-Carbon) was established, with the goal of developing a carbon grid with a tensile strength of 2,100 MPa and an elastic modulus of 150 GPa. In order to assess the performance of the K-carbon, three one-way slab specimens reinforced with K-Carbon, carbon grid manufactured with different methods, and steel were prepared, and three-point loading tests were performed. The specimen reinforced with K-Carbon had cracks occurring from the center to both ends, and the concrete was crushed and separated in the mid-span of the specimen. Although the residual mid-span deflection was smaller, cracks occurred across a wider section when compared with the reinforced steel specimen. On the other hand, the specimen reinforced with K-Carbon showed a larger mid-span deflection, even at the same load due to significantly lowered stiffness after cracking compared with the specimen reinforced with steel, and this was due to the lower elastic modulus and smaller cross-sectional area of the strands. However, the post-peak behavior of the K-Carbon reinforced specimen exhibited similar ductile behavior to the steel-reinforced specimen, which is thought to be due to the flexible nature of K-Carbon formed as a thin plate.
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