Mechanical properties of ultra-high performance concrete with different content of steel fiber
In order to clarify the influence of steel fiber content in ultra-high performance concrete(UHPC)on its mechanical properties,seven groups of steel fiber volume content of 0,1％,1.5％,2％,2.5％,3％and 4％were set with different steel fiber content as the entry point,and different shapes of specimens were designed.The effects of steel fiber content on slump,compressive strength,bending strength,splitting strength and constitutive model of UHPC are analyzed.The test results show that the slump decreases with the increase of steel fiber content.When the optimum steel fiber content is 2％,the compressive strength,bending strength and splitting strength increase the most.It is also found that the parameters of the stress-strain curve decrease with the increase of steel fiber content,and the theoretical curve is basically consistent with the fitting curve.
ultra-high performance concretesteel fiber contentmechanical propertiesconstitutive model
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