Numerical study of interactive ingress of calcium leaching, chloride transport and multi-ions coupling in concrete
Qing Feng Liu (Shanghai Jiao Tong University)
Xiao-han Shen (University of New South Wales, Shanghai Jiao Tong University)
B. Šavija (TU Delft - Materials and Environment)
Zhaozheng Meng (Student TU Delft, Shanghai Jiao Tong University)
Daniel C.W. Tsang (The Hong Kong Polytechnic University)
Samad Sepasgozar (University of New South Wales)
E. Schlangen (TU Delft - Materials and Environment)
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Abstract
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.