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Title |
Tensile Behavior of Ultra-High Performance Concrete Reinforced with Textile Reinforcement
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Authors |
염현수(Hyun-Soo Youm) ; 홍성걸(Sung-Gul Hong) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.4.399 |
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Keywords |
강섬유; 텍스타일 보강재; 초고성능 콘크리트(UHPC); 인장 거동; 합성 거동 steel fiber; textile reinforcement; ultra-high performance concrete (UHPC); tensile behavior; composite behavior |
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Abstract |
As the demand for free-form and lightweight structures has increased, textile reinforced concrete (TRC) is emerging as a promising alternative for the design and construction of more sustainable thin and lightweight concrete structures. In this study, a direct tensile test of ultra-high performance concrete (UHPC) reinforced with textile reinforcement was conducted to investigate the tensile behavior characteristics of the composite members (TR-UHPC). The test parameters included the type (Carbon[C-series], AR-Glass[G-series]) and the reinforcement ratio (0, 1, 2 layers) of the textile reinforcement as well as the volume fraction of steel fibers (0, 1, 2 %). The test results showed that as the amount of the textile reinforcement increased, initial cracking strengths consistently decreased when compared with reference specimens. Different results were observed in terms of the post-cracking stages. The C-series specimens showed lower ultimate strength with somewhat increased ductility, and slip failure of textile reinforcement. The suitable amount of AR-Glass textile reinforcement increased both ultimate strength and ductility of the TR-UHPC specimens, leading to rupture of the textile reinforcement with lower ultimate strengths than that of the bare textile reinforcement. Therefore, it is concluded that AR-glass textile reinforcement can be used for the application to TR-UHPC as it shows sufficient composite behavior, while the ultimate strength may not be estimated from a simple summation of the ultimate strengths of steel fibers and textile reinforcement. However, carbon textile reinforcement may need additional surface modifications such as sanding, abrading, or coating to improve the interfacial bond performance with UHPC.
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