Research progress on tensile and fatigue performance of ultra-high performance concrete
Ultra-high performance concrete(UHPC)is a kind of material with ultra-high tensile strength and excellent fatigue resistance.Based on relevant domestic and international literatures at home and abroad and its outstanding properties,the research progress of the tensile behavior and fatigue performance of UHPC in recent years were reviewed.In the aspect of tensile performance:the shape,size,steel fiber and material ratio of the specimen have different degrees of influence on the tensile performance of UHPC.Reasonable optimization of the amount,shape,gradation and arrangement of steel fibers is important factor to improve the tensile performance,and the surface treatment of steel fibers can also improve the tensile strength.In terms of fatigue performance,the bending fatigue properties,compressive fatigue properties and tensile fatigue properties of UHPC were overviewed.It is concluded that steel fiber has the greatest influence on the fatigue performance,and temperature,UHPC strength,stress level and the addition of other fibers and reinforcement all affect the fatigue performance of steel fiber to varying degrees.Finally,from the perspective of engineering application,the relevant specifications,application examples of UHPC in tension,fatigue resistance and bridges were summarized and reasonable suggestions were put forward.
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