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北方除冰盐地区和临海地区的混凝土耐久性问题显著。冻融循环作用会粗化孔隙结构，促进氯离子传输；另外，温度的降低会使孔隙溶液结冰，阻碍离子传输。而氯盐浓度的改变也会影响孔隙相变，进而再度作用于离子传输。针对这一复杂的耦合过程，本工作提出了冻融过程中孔隙溶液结冰率计算模型，进而分析溶液结冰对离子传输的影响，并建立经过多组第三方试验验证的冻融–离子传输的多相数值模型。结果表明：混凝土的结冰率及氯离子浓度均随着冻融循环次数的增加而增大；冻融温度及冻融持续时间对氯离子的传输具有重要影响；外界盐溶液浓度的增加虽有利于孔隙结冰温度的降低和结冰率的减小，但总体上仍加速氯离子的传输，加速混凝土耐久性的恶化。
Abstract：The durability problem of concrete structures is severe in deicing salt and marine areas. The coarsen of pore structure caused by freeze-thaw cycles(FTCs) can promote chloride transport. The pore solution can freeze into ice during the decrease of freezing temperature and consequently block chloride transport. Also, the change of chloride concentration affects the phase transition of pore solution and then chloride transport. This paper proposed a model considering freezing rate of porous solution during FTCs to analyze the effect of icing on the ionic transport. A multi-phase numerical model for coupling the binary actions of freeze-thaw and chloride transport was proposed and also verified via multiple third-party experiments. The results indicate that the freezing rate and chloride concentration increase with the increase of FTCs, and the temperature and duration of FTC both have an impact on the chloride transport. In addition, the increase of solution concentration also accelerates the chloride transport and the concrete structure deterioration although it is conducive to the decrease of pore freezing temperature and freezing rate.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20211102
中图分类号:TU528
引用信息:
[1]李林洁,刘清风.冻融循环下混凝土内部结冰及氯离子传输规律的数值研究[J].硅酸盐学报,2022,50(08):2245-2256.DOI:10.14062/j.issn.0454-5648.20211102.
基金信息:
国家自然科学基金(51978396); 上海市“青年科技启明星计划”(19QA1404700); 上海交通大学深蓝计划
2021-12-16
2021
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2022-03-11
2022-03-11
2022-03-11