PSI - Issue 45

Yipu Guo et al. / Procedia Structural Integrity 45 (2023) 66–73 Yipu Guo et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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1.5

1.5

This study Yang et al. Folino & Xargay Chen et al.

This study Yang et al. Folino & Xargay Chen et al.

+10%

+10%

1.2

1.2

-10%

-10%

0.9 ( t oct /¦ co ) model

0.9 ( t oct /¦ co ) model

0.6

0.6

AAE = 0.0480 MSE = 0.0354 SD = 0.0860

AAE = 0.0239 MSE = 0.000854 SD = 0.0337

0.3

0.3

0.4

0.6

0.8

1.0

1.2

1.4

0.4

0.6

0.8

1.0

1.2

1.4

( t oct /¦ co ) exp

( t oct /¦ co ) exp

(a) NAC (b) RACI Fig. 5. Performance of William-Warnke failure criterion for NAC and RACI. [Data collected from (Chen et al., 2015; Folino & Xargay, 2014; Yang et al., 2011)].

4. Conclusion The triaxial mechanical properties of multi-recycled aggregate concrete after 3 sequential recycling cycles were investigated in this paper. The influences of lateral confining pressure and the recycling cycles on peak stress, peak strain, and elastic modulus were presented and discussed. The main conclusions include: (1) The peak stress increases with the increase of lateral confining pressure, but the increasing rate is slightly declined at higher lateral confining pressure. The strength of Multi-RAC is inferior to NAC. RACII and RACIII show a relatively moderate downward trend than RACI under smaller confining pressure. (2) The peak strain increases with the increase of lateral confining pressure. The deformation ability of Multi-RAC is larger than NAC. RACI and RACII show obviously larger peak strain than the counterparts of NAC and RACIII. The elastic modulus of RACI and RACII are smaller than the counterparts of NAC and RACIII. (3) The obtained compression meridians of NAC and RACI based on experimental results in this study agree well with the counterparts from the literature. Therefore, based on Willam-Warnke failure criterion, a failure criterion is proposed for Multi-RAC with proper consideration of the effects of the lateral confining ratio and the number of recycling cycles. Acknowledgements The authors appreciate the support from the Australian Research Council (ARC), Australia (DP220100036, DP220101051), and the University of Technology Sydney Research Academic Program at Tech Lab (UTS RAPT).

References

Abate, S. Y., Song, K.-I., Song, J.-K., Lee, B. Y., & Kim, H.-K. (2018). Internal curing effect of raw and carbonated recycled aggregate on the properties of high-strength slag-cement mortar. Construction and Building Materials , 165 , 64-71. Chen, Y., Chen, Z., Xu, J., Lui, E. M., & Wu, B. (2019). Performance evaluation of recycled aggregate concrete under multiaxial compression. Construction and Building Materials , 229 , 116935. Chen, Y., Ji, Y., Chen, Z., Ye, P., & Wu, H. (2022). Experiment on mechanical properties of steel fiber recycled aggregate concrete under triaxial compression. Materiae Compositae Sinica (in Chinese) , 39 (8), 4005-4016. Chen, Y., Li, P., Ye, P., Li, H., & Liang, X. (2022). Experimental investigation on the mechanical behavior of polyvinyl alcohol fiber recycled aggregate concrete under triaxial compression. Construction and Building Materials , 350 , 128825. Chen, Z., Chen, Y., Xu, J., & Xue, J. (2015). Experimental study on failure criterion and stress-strain constitutive equation of recycled coarse

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