Strength and deformation of recycled aggregate concrete under triaxial compression: Fid-Bau Portal

Strength and deformation of recycled aggregate concrete under triaxial compression

Deng, Zhiheng / Wang, Yumei / Sheng, Jun / Hu, Xu

Highlights•Mechanical properties of recycled concrete under triaxial compression were studied.•The effect of RCA content and stress ratio on mechanical properties were analyzed.•Triaxial strength of recycled concrete were depicted in octahedral stress space.

AbstractExperiment was carried out to better understand the behaviors of recycled aggregate concrete under triaxial compressive stresses. The test was performed on $100 mm \times 100 mm \times 100 mm$ cubic specimens with five replacement ratios of recycled coarse aggregate (RCA) at four kinds of stress ratios, using a servo-controlled static-dynamic triaxial machine (TAWZ-5000/3000). The failure modes, ultimate strength and deformation under triaxial compression were observed, and the effect of RCA replacement ratio and stress ratio on these characteristics was analyzed. The results show that the triaxial compressive strength of the specimens is much higher than the corresponding uniaxial strength, and the strength and deformation depend on both RCA replacement ratio and stress ratio. Moreover, the factors affecting triaxial strength were quantitatively analyzed by variance calculation. Based on the triaxial strength, the relationship between normalized octahedral normal stress $σ_{oct} / f_{c}$ and octahedral shear stress $τ_{oct} / f_{c}$ with RCA replacement ratio and stress ratio was discussed.