시공조인트 표면처리방법에 따른 초고성능 콘크리트의 전단부착성능 평가

Abstract

It is necessary to involve the characteristics and quantitative surface treatment at the same time in order to retain oneness of Ultra-High-Performance Concrete(UHPC) according to construction joint occurrence. Therefore, this study derives a reasonable surface treatment method in 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 6 level that MN-0, AC-0, WJ-0, GR-10, GR-20, GR-30. After the specimen were manufactured to a size of 300×640×150 mm, Push-off test was performed to evaluate the shear adhesion strength. As a results, the bonding shear performance was increased when executing a surface treatment for the construction joint interface. As the increases in length of grooves every 10 mm, the bonding shear performance increased about 2.3 times. In this study, it is judged that 30 mm of groove length would have had an advantage for securing the monolithic of concrete. Also, the interface of cross section and the number of grooves should be considered to increasing in the bonding shear performance of concrete.