시공이음부 면처리방법에 따른 초고성능 콘크리트의 전단부착특성에 관한 실험적 연구

Abstract

Structural performance and durability of ultra-high-performance concrete(UHPC) could demonstrate optimal performance when oneness was retained. Accordingly, it is necessary to involve the characteristics and quantitative surface treatment at the same time in order to retain oneness of UHPC according to construction joint occurrence. Therefore, this study would like to derive a reasonable surface treatment method from a material’s point of view through the shear adhesion performance evaluation according to the construction joints surface processing method as a part for securing the adhesion performance of the construction joints when casting UHPC. 180 MPa of required average strength was used for mix of UHPC and surface treatment method was set to totally 5 level that MN, AC, GR10, GR20, GR30 After the specimen were manufactured to a size of 150×150×150 mm, Direct shear test was performed to evaluate the shear adhesion strength. As a result, it was confirmed that the adhesion performance was improved when executing a surface treatment for the construction joint interface and standard of failure mode of specimen was over Type C. Also, It was considered that interface of cross section and depth of concavo-convex should be concerned.