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Title |
Slant Shear Test for Determining the Interfacial Shear Strength of Concrete Strengthened with Ultra-High Performance Fiber Reinforced Concrete
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Authors |
임우영(Woo-Young Lim) ; 홍성걸(Sung-Gul Hong) |
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DOI |
https://doi.org/10.4334/JKCI.2016.28.6.637 |
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Keywords |
초고성능 콘크리트 ; 강섬유 ; 경사전단실험 ; 숏블라스팅 ; 계면 전단강도 ultra-high performance concrete ; steel fiber ; slant shear test ; shot blasting ; interfacial shear strength |
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Abstract |
In this study, slant shear tests for the prism specimens strengthened with ultra-high performance fiber reinforced concrete (UHPFRC), normal- and high-strength concrete were performed to evaluate the interfacial shear strength between old and new concrete substrate. Test parameters are the roughness of surface, concrete strength, and fiber volume fraction of UHPFRC. The surface of the concrete was roughened by shot blasting. Test results showed that the adhesion bond resistance of the specimen with a roughened surface was very large compared to that of the specimen with a smooth surface. In addition, the interfacial shear strength appeared to be affected by the concrete strength rather than the fiber volume fraction. For the roughened surface by shot-blasting method, interfacial shear resistance exceeded the upper limit which is presented in current design codes even if the shear-friction reinforcements are not provided. Based on the test results, it is applicable to use the current concrete design codes to achieve the shear-friction design for the interface between conventional concrete and UHPFRC. However, for the surface which is not processed, it would be appropriate to provide additional shear-friction reinforcement.
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