钢纤维全再生粗骨料混凝土力学性能试验及强度指标换算

Subjects: Mechanics >> Solid Mechanics submitted time 2022-11-01 Cooperative journals: 《应用力学学报》

苏炜炜1 ,陈宗平1,2,3 ,廖浩宇1 ,周星宇1

Abstract： In order to study the mechanical properties of steel fiber reinforced fully recycled coarse aggregate concrete,a total of 36 specimens with varying parameters of volume ratio of steel fiber were designed and manufactured for uniaxial compression test of cube and cylinder and bending test of prism.The failure process and modes were observed.And the stress-strain curves of the cylinder under uniaxial compression and the load-deflection curves of the prism under bending were obtained respectively.The influence of volume ratio of steel fiber on mechanical properties of recycled coarse aggregate concrete under uniaxial compression and bending was analyzed.Then the strength indexes were converted.The test results show that with the increase of volume ratio of steel fiber,under different loading systems,the integrity of the failure mode of the cube compression specimens is better,but the cylinder is worse.When the steel fiber reinforced prismatic specimens are damaged,the mid span cracks are 5- 8 mm.In order to improve the cube compressive strength of fully recycled coarse aggregate concrete with steel fiber,the recommended volume ratio of steel fiber is 1.5%.Compared with the specimens without fiber,the influence of different volume ratio of steel fiber on the compressive strength of cylinder is not obvious,some of the specimens are reduced,and the peak strain at failure increases as a whole.With the increase of volume ratio of steel fiber,the static pressure elastic modulus of the cylinder first increases and then decreases,and the axial compression toughness ratio of cylinder under uniaxial compression gradually increases.Steel fiber does not affect the initial toughness of fully recycled coarse aggregate concrete,and the residual flexural toughness increases with the increase of volume ratio of steel fiber.

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