Experimental Study And Numerical Simulation Of Performance Of Fiber Reinforced Self-Compacting Concrete

With the progress and development of technology,various styles of complex concrete structures become more and more,also the difficulty of construction has become larger and larger The flowability of fiber self-compacting concrete is good,and the existence of fiber can improve the tensile strength of concrete,poor impact resistance and many other defects.It is widely used in the practical engineering.Therefore,the mechanical properties and constitutive relationship of fiber self-compacting concrete are very important issues.In this paper,the performance of basalt fiber and steel fiber self-compacting concrete are studied by experiment and numerical simulation.First,the performance tests of six groups of basalt fiber self-compacting concrete with different volume contents The results show that with the increase of fiber content,the fluidity of the mixture is getting worse.The addition of fiber reduces the compressive strength,but it can effectively inhibit the development of cracks.The flexural strength enhances with the increase of the content and the crimp ratio.Then,The flexural strength tests of five groups of steel fiber self-compacting concrete specimens with different volume contents The influence of two kinds of fibers on the toughness of concrete is compared with that of steel fiber and basalt fiber concrete with 0.3%content.At the same time,the static compression modulus test of two kinds of fiber self-compacting concrete with 0.3%content is carried out.The results show that the incorporation of steel fibers in self-compacting concrete can significantly improve the flexural strength,and the flexural strength is positively correlated with the fiber content.Under the same content(0.3%),the toughening effect of the steel fiber is better.the steel fiber improves the elastic modulus of the concrete,and the basalt fiber reduces it.Then,based on the data of 1%steel fiber self-compacting concrete bending test and the composite material theory,the numerical model of steel fiber self-compacting concrete is established by ABAQUS finite element software image.The numerical simulation of the failure process of the beam is carried out.The results are compared with the experimental results to verify the validity and accuracy of the numerical simulation The mechanical properties of the two kinds of materials during the failure process of steel fiber self-compacting concrete are explored at a micro view.Finally,the content,distribution and length of steel fiber are subjected to variable parameter calculation and analysis.And the effects of these factors on the properties of steel fiber reinforced concrete are further analyzed.The results show that with the increase of steel fiber content,the flexural toughness of concrete is improved.The unidirectional distribution of fibers is extremely efficient for fiber utilization,reaching 14.4%.In the case of constant volume of the volume,the length of the fiber is appropriately increased,and the development of the cracks can be suppressed,and the bending toughness can be improved.