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The Biaxial Compressive Mechanical Properties and Strength Criterion of Recycled Aggregate Concrete Under Different Dynamic Strain Rates

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Abstract

In this paper, the tests under biaxial compression were conducted on five kinds of recycled aggregate concrete (RAC) by stress ratios (0:−1, −0.1:−1, −0.25:−1, −0.5:−1, −0.75:−1, and −1:−1) at the strain rates of 10–5/s, 10–4/s, 10–3/s, and 10–2/s. This study was accomplished in the servo-hydraulic multi-axial testing system, which was carried at Dalian University of Technology. The experimental phenomena of RAC under biaxial compression are described, and the experimental results of biaxial compressive strength of RAC are analyzed. The effects of strain rate, stress ratio, and substitution percentages of recycled coarse aggregate (RCA) on the biaxial compressive strength of RAC were studied. During the experiments, the failure modes of concrete have not been changed because of the increased impact of the RCA on RAC. The strength of RAC is improved with the increase in strain rates. With the increase in stress ratios, the biaxial compressive strength increases at first. However, the strength then decreases. Based on the strength theory of common concrete and analysis of experimental data, this paper built a new dynamic strength criterion. The biaxial compressive strength criterion describes the characteristics of structural RAC at different stress ratios and strain rates. This strength criterion can provide theoretical foundation for future concrete multi-axis dynamic tests and the design specification with the considerations of multi-axis dynamic strength and nonlinear analysis. The feature of the model is that it can take into account the influence of strain rates.

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Abbreviations

RAC:

Recycled aggregate concrete

RCA:

Recycled coarse aggregate

RAC20:

C20 strength grades of recycled aggregate concrete

RAC40:

C40 strength grades of recycled aggregate concrete

RAC60:

C60 strength grades of recycled aggregate concrete

RCA-30%:

The replacement percentage of RCA is 30%

RCA-50%:

The replacement percentage of RCA is 50%

f cu :

the uniaxial compression strength for 150 mm cubes of recycled aggregate concrete specimen

f t :

the uniaxial tensile strength of the 100 mm × 100 mm × 100 mm cubes without friction-reducing pads at 3 months

f c :

the uniaxial compressive strength of the 100 mm × 100 mm × 100 mm cubes with friction-reducing pads at 3 months and its strength value are about equal to that of 150 mm × 150 mm × 300 mm prism

ξ:

the loading strain rates for RAC specimen

\(f_{{\text{c}}}^{\xi }\) :

the uniaxial compressive strength at the corresponding strain rate

f cc :

the biaxial compressive strength when the stress ratio σ23 is equal to 1

α = σ23 :

the stress ratio of proportional loading under biaxial compression

σ1f, σ3f :

the tensile–compressive failure strengths in the two principal directions, respectively

σ2f, σ3f :

the biaxial compressive failure strengths in the two principal directions, respectively

\(\sigma_{3f}^{\xi }\) :

the biaxial compressive strength in the third principal directions at the corresponding strain rate

\(\xi_{S}\) :

the quasi-static loading strain rate (10–5/s) of RAC

\(\mathrm{lg}\left(\frac{\xi }{{\xi }_{s}}\right)\) :

the logarithm of strain rates

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Acknowledgments

This study was supported by the Yuyou Talent Support Plan of North China University of Technology (Grant No. 2018-39).

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Correspondence to Zhen-jun He.

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He, Zj., Ding, Mj., Zhang, Xj. et al. The Biaxial Compressive Mechanical Properties and Strength Criterion of Recycled Aggregate Concrete Under Different Dynamic Strain Rates. Iran J Sci Technol Trans Civ Eng 45, 125–146 (2021). https://doi.org/10.1007/s40996-020-00507-5

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