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Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress

机译:单轴和双轴持续压力下混凝土中氯离子扩散的实验研究

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摘要

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.
机译:轴向和横向压缩应力的存在影响混凝土中氯离子的扩散将导致混凝土结构的性能下降。本文在一维氯化物溶液侵蚀下研究了单轴和双轴持续压缩应力的氯化物扩散性能。通过在混凝土中测试氯化物浓度来评价不同持续压缩应力状态对氯离子扩散性的影响。实验结果表明,持续压缩应力的存在并不总是抑制混凝土中氯离子的扩散,并且持续压缩应力水平的数值可以影响混凝土中氯离子的扩散规律。发现当横向压缩应力水平接近混凝土的抗压强度的0.15倍时,氯化物浓度大部分降低。此外,持续压缩应力对高水/水泥比混凝土的氯离子扩散具有显着影响。然后,基于表观氯化物扩散系数建立单轴和双轴持续压缩应力下的氯化物扩散系数模型。最后,结果表明,通过从开发模型的计算值比较开放文献中的实验数据,氯化物扩散系数模型是合理的,可行的。

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