Abstract
This paper presents an experimental research on the triaxial behavior of 270 steel fiber recycled aggregate concrete (SFRAC) specimens under true triaxial compression (σ1≠σ2≠σ3). By using a servo-hydraulic closed loop testing system, triaxial loading experiments were conducted considering three variables - the volume fraction of steel fiber (Vf), the replacement ratio of recycled coarse aggregate (RAR), and the stress ratio (α). The influences of these parameters on the failure modes, the stress–strain curves and the peak triaxial strength are analyzed. The experimental results indicated: (i) the stress ratio had the most significant effect on the failure mode of SFRAC specimens, where four modes were observed; (ii) the peak triaxial strength of specimens was sensitive to Vf, and a value between 0.6% and 1.2% was found to be optimum; (iii) the minimum stress ratio σ1/σ3 and the second stress ratio σ2/σ3 exhibited opposite effects on the peak triaxial strength of specimens, while RAR showed the least effect. Finally, a three-parameter failure criterion for SFRAC under true triaxial compression was proposed. The experimental results will provide SFRAC triaxial mechanical behavior for future engineering design and applications.
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