Effects of Groove and Steel Fiber on Shear Properties of Concrete with Recycled Coarse Aggregate

Abstract

In this paper, a series of shear specimens with or without groove were manufactured to mainly analyze the effects of grooves (or shear section height) and steel fibers on the shear properties of concrete with recycled coarse aggregate through double-side direct shear test. In addition, the relationship between the shear strength and the compressive strength and splitting tensile strength of steel fiber reinforced concrete with recycled coarse aggregate (SFRCAC) was also discussed. The experimental results showed that the peak load, deformation corresponding to the peak load and calculated shear strength of the specimens with grooves were lower than those of the specimens without grooves. The steel fiber and recycled coarse aggregate (RCA) had a significant effect on the shear properties of SFRCAC. As the volume content of steel fibers increased, the shear strength of SFRCAC and the corresponding deformation increased gradually. With the replacement ratio of RCA increasing, the shear strength of SFRCAC decreased but the corresponding deformation increased gradually. Finally, the formula for calculating the shear strength of SFRCAC was proposed by analyzing and fitting the test results and the data of related literature.

Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

“…Additionally, all developed HyFRC specimens showed quasi-brittle characteristic with a strain-softening mode of failure under the direct shear. Similar findings have also been reported in other studies [ 31 , 36 ]. Figure 6 superimposes the density on the shear strength of all HyFRC specimens, which revealed that a proper, consistent mix was achieved during the casting of the HyFRC with no effect on the shear strength results.…”

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

“…Shi et al believed that pretreatment of RA by carbonization is environmentally friendly and effective [ 21 ]. The use of biotreatment or the incorporation of steel fiber and nanosilica can improve both the mechanical properties and microstructure of RAC [ 22 , 23 , 24 , 25 ].…”

Effect of Microstructure on the Mechanical Properties of Steel Fiber-Reinforced Recycled Concretes

“…As expected, Figure 14 shows that the fitting coefficients are sufficient for satisfying the requirement. To verify the reliability of Equations (7)–(9), the data of Gao [ 33 , 34 ], Carneiro [ 35 ], Yazc [ 36 ], Ahmadi [ 37 ], and Kachouh [ 38 ] were used to compare the calculation results of the formula with the test results. The results are listed in Table 7 .…”