Abstract
The experiments under biaxial tensile-compressive (T-C) complex stress were carried out for two kinds of substitution percentages of recycled coarse aggregate (RCA) on biaxial proportional loading (α = σ1:σ3 =1:0, 0: −1, 0.05: −1, 0.1: −1, 0.25: −1, 0.5: −1, 1: −1 and−1: −1) and four loading deformation rates of 10−5/s, 10−4/s, 10−3/s, and 10−2/s. The research was completed in the static-dynamic true triaxial machine. The experimental phenomena indicate the tensile failure appears in these specimens of recycled aggregate concrete (RAC) under biaxial T-C stress states. The dynamic mechanical behavior for RAC under biaxial T-C loadings was affected by the strain rates, stress ratios and its substitution percentages of RCA. Accompanied by the increase of strain rates, its strength of RAC is improved. As the tensile stress increases, its compressive strength decreases. The T-C strengths for RAC under biaxial T-C states are less than its corresponding uniaxial T-C strengths at a certain identical strain rates, respectively. Considering the effect of loading rates, a new tensile-compressive failure criterion is established under complex stress states.
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Abbreviations
- f cu :
-
Uniaxial compression strength for 150 mm cubes of recycled aggregate concrete specimen
- \(f_c^v\) :
-
Uniaxial compressive strength at the corresponding strain rate
- lgv :
-
Logarithm of strain rates
- RAC-30:
-
Substitution rates of RAC are 30%
- RAC-50:
-
Substitution rates of RAC are 50%
- RAC40:
-
C40 strength grades of RAC
- v :
-
Loading strain rates for RAC specimen
- α=σ1:σ3=σ1/σ3 :
-
Stress ratio of proportional loading under tension-compression
- δ v :
-
Conversion coefficient between its uniaxial tensile strength and triaxial equal tensile strength
- σ1f, σ3f :
-
Tensile–compressive failure strengths in the two principal directions, respectively
- \(\sigma_{octt}^v\) :
-
Octahedral normal stress at a certain strain rate
- \(\sigma_t^v, \sigma_{ttt}^v\) :
-
Uniaxial tensile strength and triaxial equal tensile strength, respectively
- \(\tau_{octt}^v, \tau_{octc}^v\) :
-
Octahedral shear stress on tensile–compressive meridians, respectively
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Acknowledgements
This study was supported by the Yuyou Talent Support Plan of North China University of Technology (Grant No. 2018-39).
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He, Zj., Wang, Zq., Ding, Mj. et al. The Dynamic Mechanical Properties for Recycled Aggregate Concrete under Tensile-Compressive States. KSCE J Civ Eng 24, 1486–1498 (2020). https://doi.org/10.1007/s12205-020-2307-0
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DOI: https://doi.org/10.1007/s12205-020-2307-0