Effect of mixed fibers on the basic mechanical properties of full desert sand concrete
In order to study the effect of mixed fibres on the mechanical properties of all-desert sand concrete,polyvinyl alcohol fibres(PVA fibres)and polypropylene fibres(PP fibres)were mixed in different proportions and then blended into the all-desert sand concrete to conduct the tests of compression and flexural resistance,and the uniaxial compressive stress-strain constitutive model of the material was also established,and numerical simulation was carried out using ABAQUS software for verification.The results show that:under the condition that the total volume of mixed fiber mixing is 1.5%,there is no significant change in the compressive strength of the specimen,with the increase of the proportion of PVA fibers,the flexural strength,tensile strength and tensile peak strain of the specimen increased significantly;compared with the ordinary all-desert sand concrete,the peak stress and modulus of elasticity of the mixed-fiber all-desert sand concrete are slightly reduced,and deformation capacity is significantly improved;PP fiber and PVA fiber dosage of 0.5%and 1.0%respectively have the optimal mixing effect,compared with ordinary all-desert sand concrete,the flexural strength,uniaxialtensile strength and ductility were improved by 77%,55%and 16%,respectively;the axial compressive stress-strain constitutive model based on the Guo Zhenhai model fits well with the experimental measured curves and is similar to the results verified with numerical simulation of ABAQUS software.
all desert sand concretepolyvinyl alcohol fiberspolypropylene fibersmechanical propertiesconstitutive model
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