Numerical Simulations of Chloride Transport in Concrete Considering Connectivity of Chloride Migration Channels in Unsaturated Pores
Numerical Simulations of Chloride Transport in Concrete Considering Connectivity of Chloride Migration Channels in Unsaturated Pores
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DOI：
10.3151/jact.19.847
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发表时间：
2021-07
影响因子：
2
通讯作者：
Tatsuya Nukushina;Yuya Takahashi;T. Ishida
中科院分区：
文献类型：
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作者：
Tatsuya Nukushina;Yuya Takahashi;T. Ishida
本研究的目的是发展一种方法，合理预测氯离子侵入混凝土在非饱和条件下。为了实现这一目标，硬化水泥浆体中的孔隙网络和水路径的连通性进行了研究，并在现有的数值分析系统建模。对以往水泥石连续孔隙率的测量结果进行了整理，明确了水泥石总孔隙率与连续孔隙率之间的关系，并将其表述为孔隙连通度。此外，液态水在非饱和孔隙结构中的连通性是参照以前的数值研究制定的，这表明液态水的连通性在较低的饱和度降低。此外，通过考虑孔隙连通性和不饱和条件下的液态水连通性计算氯离子传输，氯离子渗透到不饱和混凝土中，包括空气中的氯离子环境，可以再现比以前更现实。
This study aimed to develop a method for the reasonable prediction of chloride ingress into concrete under unsaturated conditions. To achieve this, the connectivity of both the pore networks and the water paths in hardened cement paste were investigated and modeled in the existing numerical analytical system. Previous measurement results for the continuous porosity in hardened cement paste were reorganized, and the relationship between the total porosity and continuous porosity was clarified and formulated as the pore connectivity. In addition, the connectivity of the liquid water in unsaturated pore structures was formulated referring to previous numerical studies, suggesting that the connectivity of the liquid water decreases at a lower degree of saturation. Furthermore, by calculating the chloride transport considering the pore connectivity and the liquid water connectivity under unsaturated conditions, the chloride penetration into unsaturated concrete, including an airborne chloride environment, could be reproduced more realistically than was previously possible.