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Title |
Effect of Surface Preparation and Curing Condition on the Interfacial Bond Strength between Ultra High Performance Concrete and Normal Strength Concrete
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Authors |
강성훈(Sung-Hoon Kang) ; 홍성걸(Sung-Gul Hong) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.3.149 |
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Keywords |
초고성능 콘크리트 ; 부착강도 ; 영구거푸집 ; 합성구조 ; 계면 Ultra high performance concrete (UHPC) ; Bond strength ; Permanent formwork ; Composite structure ; Interface |
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Abstract |
This study reports the interfacial bond strength between Ultra High Performance Concrete (UHPC) and Normal Strength Concrete (NSC). While previous studies have focused on the interfacial strength between NSC substrate and UHPC overlay, this study use precast UHPC for enhanced constructability and replacement of formwork. The factors affecting the interface strength are comprehensively reviewed. It can be classified into: interface shape, degree of hardening and moisture condition of UHPC before combining with NSC, and curing condition of composite materials. Conducted experiments verify the effects of each factor on the interface strength and, accordingly show different failure modes. In particular, a new failure mode of the failure of a part of UHPC was firstly found in the case of sample with rough interface between UHPC and NSC. The other factors of the degree of hardening and the moisture and curing conditions of UHPC were discussed. This research will provide a valuable foundation toutilize the UHPC as a composite material.
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