Experimental Study On Axial Compression Mechanical Properties Of Fe-based Amorphous Alloy Fiber Reinforced Concrete

Because of its excellent mechanical properties and ease of preparation,fiber concrete has been increasingly used in many civil engineering projects such as high-rise buildings,bridge structures,and national defense.The Fe-based Amorphous Alloy(FAA)fiber has extremely high breaking strength,high elastic modulus,and excellent corrosion resistance.It is a kind of amorphous metal fiber with good comprehensive performance.The effect of iron-based amorphous alloy fiber on the reinforcement,toughness and crack resistance of concrete will change the mechanical behavior of concrete materials.Therefore,this article takes iron-based amorphous alloy fiber concrete as the research object,and studies the effects of fiber volume,fiber length,and concrete strength on the axial compressive properties of concrete.Engineering application and follow-up research provide reference.The work and research results of this article mainly include:(1)Based on the idea of orthogonal test,the influence of water-binder ratio,fiber volume content and fiber length on the cube compressive strength and splitting tensile strength of Febased amorphous alloy fiber reinforced concrete was discussed.The results show that the optimal combination of various factors on the cube compressive strength of concrete is 0.2%fiber volume content,15 mm fiber length and 0.4 water-binder ratio.The optimal combination of splitting tensile strength of concrete is 0.1% fiber volume content,20 mm fiber length and0.4 water-binder ratio.(1)Based on the idea of orthogonal experiment,considering the three factors of waterbinder ratio,fiber volume and fiber length,the influence of the three factors on the compressive strength and splitting tensile strength of iron-based amorphous alloy fiber concrete cubes is discussed.The results show that the optimal combination of various factors for the compressive strength of concrete cubes is 0.2% fiber volume,fiber length 15 mm,and water-binder ratio 0.4.The optimal combination of concrete splitting tensile strength is 0.1% fiber volume.,The fiber length is 20 mm,and the water-to-glue ratio is 0.4.(2)Considering factors such as fiber volume,fiber length and concrete strength,study the uniaxial compressive properties of Fe-based amorphous alloy fiber concrete,and analyze the influence of various factors on the failure form,stress-strain curve,elastic modulus,peak value.The influence of strain and compressive toughness.The results show that compared with the benchmark concrete,the addition of iron-based amorphous fiber can significantly improve the failure form of the concrete.When it fails,the fiber-reinforced concrete soil exhibits better ductility and integrity,and the peak stress and peak strain of fiber-reinforced concrete are higher.,The modulus of elasticity is higher,and the toughness is better.(3)Using the theory of continuum damage mechanics,the damage constitutive models of Fe-based amorphous alloy fiber concrete based on statistics and elastoplastic mechanics were established respectively.According to the test results,the model parameters of the two damage constitutive models were determined.The results show that the two damage constitutive models are in good agreement with the experimental results,and can better simulate the uniaxial compressive properties of Fe-based amorphous alloy fiber concrete.