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Title |
Performance Evaluation of Precast Deck Joints Using Ultra High-Performance Concrete Part 1: Focus on Bond Characteristics Analysis
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Authors |
강호비(Ho-Bi Kang) ; 임동규(Dong-Gyu Lim) ; 김영진(Young-Jin Kim) ; 최명성(Myoung-Sung Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.5.563 |
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Keywords |
이음길이; 초고강도; 부착응력; 프리캐스트; 이음성능평가 lap splice length; high-strength; bond stress; precast; splice test |
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Abstract |
This study experimentally investigated the bond performance of precast bridge deck joints incorporating ultra-high-performance Concrete (UHPC), aiming to overcome the limitations of existing design codes and enhance both constructability and structural efficiency. Traditional jointing methods, such as loop splices, exhibit drawbacks like reduced constructability and structural inefficiency. As an alternative, UHPC was applied as a joint-filling material to assess its potential for reducing splice lengths while securing structural performance. Fourteen splice specimens were tested under four-point loading, with compressive strength levels (80 MPa, 100 MPa, 120 MPa) and splice lengths (8db, 10db, 15db) considered as primary variables. The test results demonstrated that UHPC with a compressive strength of 100 MPa achieved sufficient structural performance even with splice lengths shorter than those specified in current design standards. Additionally, improvements in bond stress and crack control attributed to fiber reinforcement were observed. These findings provide fundamental data for improving anchorage and splice design provisions to reflect the superior material properties of UHPC, while also maximizing the constructability advantages of precast construction.
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