Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 325, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126797
Keywords
Chloride; Cracking; External load; Multi-phase; Multi-ions; Durability
Categories
Funding
- National Natural Science Foundation of China [51978396]
- Shanghai Rising-Star Program, China [19QA1404700]
- Oceanic Interdisciplinary Program of Shanghai Jiao Tong University, China [SL2021MS016]
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This study presents a multi-species and multi-phase model considering the time-dependent cracking in concrete. The crack propagation and chloride diffusion are coupled by statistical learning approach, and the effect of the electrostatic potential on multi-species transport is considered. The validity of the model is verified against third-party experiments, and the impacts of different crack characteristics and environmental factors on chloride transport are discussed.
Reinforced concrete (RC) structures have been severely threatened by chloride attacks during long-term service, particularly under mechanical loading conditions. This study presents a multi-species and multi-phase model considering the time-dependent cracking in concrete. In addition to the crack propagation and chloride diffusion being individually modelled, these two processes are coupled by statistical learning approach, which is supposed to better reveal the influence of cracking on chloride transport. Meanwhile, the electrostatic potential generated by the inner charge imbalance and its effect on multi-species transport is also considered. The validity of the presented model is verified against third-party experiments following the standard of RILEM TC 246-TDC. The impact of different crack characteristics on chloride transport was carefully elaborated, and the effects caused by multi-species interactions, coupling between cracking and chloride ingress, as well as other environmental factors such as external concentration are also discussed in detail. The findings of presented study can better enhance the understanding on the deterioration of both durability and bearing capacity of RC structures.
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