Bonding Performances of Ultra High Performance Concrete to Normal Concrete Under Freeze-Thaw Cycle
YU Ziruo1, SHEN Jie1, JIA Fangfang2, 3, AN Mingzhe1
1 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044; 2 Beijing Engineering Research Center of Architectural Functional Macromolecular Materials, Beijing Building Construction Research Institute, Co., Ltd., Beijing 100039; 3 Road and Bridge Department, Beijing Jiaotong Vocational Technical College, Beijing 102200
Abstract: 147 ultra high performance concrete-normal concrete bonded cubes with dimension of 100 mm × 100 mm × 100 mm were tested to investigate the bonding performance under freeze-thaw cycle test. The relative dynamic elastic modulus, mass loss rate and splitting tensile strength of specimens were measured after freeze-thaw cycle. The effects of steel fibers in ultra high performance concrete, the strength of normal concrete, the form of bonding surface and the casting direction of concrete on the freeze-thaw resistance of bonded specimens were studied. The results show that the ultra high performance concretes in all bonded specimens remain undamaged after the freeze-thaw cycle, and the ultra high performance concrete can be applied as an ideal external enclosure material for normal concrete structures. With the increase of the freeze-thaw cycles, the relative dynamic elastic modulus of specimens are decreased gradually, the mass loss rates are decreased first and then increased, and the splitting tensile strengths are decreased linearly. The key factors that affect the rate of strength decline of the bonded specimens under freeze-thaw cycle are the contents of steel fiber in ultra high performance concrete and the form of bonding surface.
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2017, Vol. 31 
