Shear behavior of three types of recycled aggregate concrete

Abstract

This paper studied the shear behavior of three types of recycled aggregate concrete with different replacement levels of recycled coarse aggregate. Sixty cube specimens and thirty beam specimens with uniform depth and varying width were designed to test their mechanical parameters including cube compressive strength, splitting tensile strength, shear strength, peak shear strain, shear stress-strain curves, and shear modulus. We analyzed how these parameters are influenced by the type of recycled coarse aggregate and by recycled coarse aggregate replacement level. We established the strength conversion equations, one-parameter polynomial non-dimensional shear stress-strain equations, and shear modulus calculation formulas of three types of recycled aggregate concrete. It is found that the strength of recycled aggregate concrete I isslightly lower than that of conventional concrete and decrease with the increase of recycled coarse aggregate replacement level. However, the strength of recycled aggregate concrete II and recycled aggregate concrete III is slightly higher than that of conventional concrete when the recycled coarse aggregate replacement ratio is less than 70%. As the recycled coarse aggregate replacement ratio increase, the peak shear strain of three types of recycled aggregate concrete gradually decreases. The shear strength and peak scant shear modulus of three types of recycled aggregate concrete show the rule of recycled aggregate concrete III > recycled aggregate concrete II > recycled aggregate concrete I. Furthermore, the calculated values of several equations established by the authors agree well with the test values.