Freeze-Thaw Damage Constitutive Model of Composite Cementitious Modified Porous Concrete

Yuhang Qin; Jian Yin

doi:10.54691/7m44sn86

Authors

Yuhang Qin School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
Jian Yin School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China

DOI:

https://doi.org/10.54691/7m44sn86

Keywords:

Porous Concrete; Composite Cementitious Modification; Freeze-thaw Cycle; Stress-strain Curve; Damage Constitutive Model.

Abstract

To systematically investigate the effects of composite cementitious modification on the mechanical performance evolution and damage behavior of porous concrete (PC) under freeze-thaw conditions, porous concrete systems with different modification levels were established, and freeze-thaw cycling and uniaxial compression tests were conducted. Based on the stress-strain curves, the mechanical response characteristics and damage evolution behavior of PC under freeze-thaw action were systematically analyzed. According to Lemaitre’s strain equivalence principle and Weibull statistical distribution theory, a nonlinear damage constitutive model considering cumulative freeze-thaw damage was established. The results indicate that composite cementitious modification can significantly improve the compressive strength and mechanical stability of unfrozen PC, while the brittle failure characteristics become more pronounced with increasing modification level. With increasing freeze-thaw cycles, all PC specimens exhibited reductions in peak stress and elastic modulus, increases in peak strain, and gradual flattening of the descending branch, indicating enhanced deformation capacity at macroscopic failure. Among all groups, the specimen with moderate composite modification level exhibited the optimal balance between strength retention and freeze-thaw resistance, maintaining relatively high bearing capacity after 48 freeze-thaw cycles. The proposed constitutive model accurately described the stress-strain relationships of PC at different freeze-thaw stages. The predicted curves agreed well with the experimental results, and the fitting correlation coefficients (R²) were all higher than 0.97. The damage variable exhibited an J-shaped growth trend with increasing strain and finally approached 0.8 near failure. The results of this study can provide theoretical support for freeze-thaw damage analysis and durability prediction of porous concrete structures in cold regions.

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