Abstract
The existence of axial and lateral compressive stress affect the diffusion of chloride ions in concrete will lead to the performance degradation of concrete structure. This paper experimentally studied the chloride diffusivity properties of uniaxial and biaxial sustained compressive stress under one-dimensional chloride solution erosion. The influence of different sustained compressive stress states on chloride ion diffusivity is evaluated by testing chloride concentration in concrete. The experiment results show that the existence of sustained compressive stress does not always inhibit the diffusion of chloride ions in concrete, and the numerical value of sustained compressive stress level can affect the diffusion law of chloride ions in concrete. It is found that the chloride concentration decreases most when the lateral compressive stress level is close to 0.15 times the compressive strength of concrete. In addition, the sustained compressive stress has a significant effect on chloride ion diffusion of concrete with high water/cement ratio. Then, the chloride diffusion coefficient model under uniaxial and biaxial sustained compressive stress is established based on the apparent chloride diffusion coefficient. Finally, the results demonstrate that the chloride diffusion coefficient model is reasonable and feasible by comparing the experimental data in the opening literature with the calculated values from the developed model.
Highlights
The durability of concrete material is considered as one of the most important problems of concrete structures
To characterize the diffusivity of concrete under sustained compressive stress, the systematic experiments and numerical studies are carried out on ordinary concrete exposed to one-dimensional chlorine salt erosion under different sustained compressive stress conditions
This paper introduces the experimental study on the influence of different sustained compressive stresses on chloride ion diffusivity of concrete in chloride ion solution, and the influence of water/cement ratio on chloride ion diffusivity
Summary
The durability of concrete material is considered as one of the most important problems of concrete structures. Materials 2020, 13, 5717 results show that the diffusion law of chloride ions do not change obviously after stress damage of concrete [11,12,13,14]. Few studies focus on chloride diffusion properties of different w/c concrete under biaxial sustained compressive stress. It is necessary to investigate the chloride diffusion of concrete structures with different w/c ratios under biaxial sustained compressive stress.In view of the preceding brief discussion, this study is to analyze the diffusion law of chloride ions in concrete under different compressive stress conditions. A series of chloride ion penetration experiments of concrete under uniaxial and biaxial sustained compressive stress are carried out, and the variation law of chloride concentration in concrete is analyzed. The applicability of the diffusion models is verified by the experimental data from the published literatures
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