Numerical study of interactive ingress of calcium leaching, chloride transport and multi-ions coupling in concrete
Numerical study of interactive ingress of calcium leaching, chloride transport and multi-ions coupling in concrete
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DOI：
10.1016/j.cemconres.2022.107072
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发表时间：
2023-01-11
影响因子：
11.4
通讯作者：
Schlangen, Erik
中科院分区：
文献类型：
--
作者：
Liu, Qing-feng;Shen, Xiao-han;Schlangen, Erik
在废水和海水环境下，混凝土中钙、氯离子等多种离子的行为受到关注。本研究探讨了在上述特殊田间条件下可能发生的多种机制，包括钙浸出、氯离子迁移和多离子耦合。为了实现多离子的交互进入，采用了对单个机理的处理和相互影响的模拟方法。分析了界面过渡区对各种离子分布的影响。考虑孔隙溶液和固相中钙离子的相互作用，研究了孔隙度的时空分布及其演化机制。结果表明，钙的浸出主要是由于孔隙结构的粗化而加速了氯离子的迁移，而多离子的电化学耦合作用在初期促进了钙的浸出，但在后期则略微延缓了钙的浸出。
In circumstances with wastewater and seawater, the behavior of multi-ions including calcium, chloride and others in concrete attracts attention. The present study investigated the multiple mechanisms that could happen under the special field situation above, including calcium leaching, chloride transport and multi-ion coupling. To realize the interactive ingress of multi ions, the simulation method for the processing of the individual mechanisms and the mutual influences is adopted. The distributions of the diversified ions are analyzed with the influence of the interfacial transition zone. The time-spatial distribution of porosity and its evolution mechanisms are investigated by considering the interaction with calcium ions in both pore solution and solid phase. The results indicate that calcium leaching would dominantly speed up chloride transport due to the coarsened pore structure, while the multi ions electrochemical coupling effect would facilitate calcium leaching in the early stage but subtly delay calcium leaching in the later stage.