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http://dx.doi.org/10.11112/jksmi.2015.19.3.149

Effect of Surface Preparation and Curing Condition on the Interfacial Bond Strength between Ultra High Performance Concrete and Normal Strength Concrete  

Kang, Sung-Hoon (서울대학교 건축학과)
Hong, Sung-Gul (서울대학교 건축학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.19, no.3, 2015 , pp. 149-160 More about this Journal
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 to utilize the UHPC as a composite material.
Keywords
Ultra high performance concrete (UHPC); Bond strength; Permanent formwork; Composite structure; Interface;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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