Three-Dimensional Mesonumerical Model of Freeze-Thaw Concrete Based on the Porosity Swelling Theory

Gan, Lei; Feng, Xinbin; Zhang, Hongwei; Shen, Zhenzhong; Xu, Liqun; Zhang, Wenbing; Sun, Yiqing

doi:10.1061/jmcee7.mteng-15629

Cited by 5 publications

(1 citation statement)

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“…However, the model is mainly based on the crystallization pressure of ice rather than the hydraulic pressure model, which was developed by Powers [11,12]. Gan et al [24] investigated the changes in the pore structure of the concrete under freeze-thaw cycles using a three-dimensional mesonumerical model. The model is based on the porosity swelling theory, which takes into account the porosity expansion due to cyclic freeze-thaw attacks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Freezing Behavior of Saturated Cementitious Materials with Different Amounts of Chloride

Zadran,

Ožbolt,

Gambarelli

2023

Materials

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The freezing behavior of cement paste saturated with different chloride concentrations is investigated numerically with a coupled 3D hygro-thermo-mechanical FE analysis. The mathematical formulation of the freezing processes in the context of poromechanics takes into account the water (hydraulic) and ice pore pressures, as well as the distribution of heat (temperature) and strains. These quantities are calculated numerically based on three coupled differential equations, namely the static equilibrium equation and the equations for the transport of water and heat. The coupling between the mechanical (loading) and the non-mechanical processes (freezing) is performed using a staggered solution scheme. The proposed numerical approach is first validated using numerical and experimental studies from the literature dealing with two different cement pastes saturated with different amounts of chloride. The validated model is then used to investigate the effects of liquid water permeability, total porosity and pore size distribution on the freezing behavior of hardened cement paste. The results show that liquid water permeability has a strong effect on the pore pressure and deformation of the hardened cement paste. It is also shown that by decreasing the total porosity, the material becomes denser and contracts more as the temperature decreases, leading to a decrease in freezing strain. The results of this paper will provide important findings for the development of a simplified engineering model to investigate the mechanism that leads to freeze–thaw salt-induced damage to concrete structures in the framework of the DFG-funded research project.

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Section: Introductionmentioning

confidence: 99%