荷载作用下开裂混凝土中多离子传输的数值研究

doi:10.11896/cldb.21120077

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Abstract Reinforced concrete structures, especially those under service load, are suffering from severe durability problems in coastal areas. Because of the action of external load, initial flaws pre-existed in concrete will continuously propagate into macro cracks, which will in turn aggravate chloride attack and lead to durability degradations. Besides, the presence of various ionic species in concrete pore solution can also affect the chloride transport behavior. In order to investigate the concrete durability deterioration under the combined action of external loading and chloride ingress, a numerical study was carried out to fundamentally disclose the underlying mechanisms. The influence of concrete cracking and pore structure damage was essentially quantified, and the electrochemical coupling effects caused by various ionic species were also considered. The validity of the proposed numerical model was benchmarked with a third-party experiment at length. Results show that both loading magnitude and mode will not only influence pore structure and cracking morphology, but also differentiate electrostatic potential distribution compared to sound concrete. Electrochemical coupling effect under external loading significantly affects the ionic transport behaviors, and single-ionic assumption will underestimate chloride concentration. Moreover, the influence of environmental factors like external chloride concentration will also be amplified due to external loading.

Key words： loading chloride cracking multi-species transport porosity numerical model

Published: 10 May 2023 Online: 2023-05-04

CLC number:

TU528

Fund:National Natural Science Foundation of China (51978396), Shanghai Rising-Star Program (19QA1404700), and Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (SL2021MS016).

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	HU Zhe
	LIU Qingfeng

Cite this article:

HU Zhe,LIU Qingfeng. Numerical Study of Multi-species Transport in Cracked Concrete Under External Load[J]. Materials Reports, 2023, 37(9): 21120077-9.

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http://www.mater-rep.com/EN/10.11896/cldb.21120077 OR http://www.mater-rep.com/EN/Y2023/V37/I9/21120077

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