Mesoscopic Model and Parameter Characterization of Concrete Under Sulfate Attack

LIU Xinrong; CHEN Hai; ZHAUNG Yang; ZHOU Xiaohan; XIAO Yu

doi:10.3724/j.gyjzG23042807

Volume 54 Issue 9

Sep. 2024

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LIU Xinrong, CHEN Hai, ZHAUNG Yang, ZHOU Xiaohan, XIAO Yu. Mesoscopic Model and Parameter Characterization of Concrete Under Sulfate Attack[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 177-184. doi: 10.3724/j.gyjzG23042807

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Mesoscopic Model and Parameter Characterization of Concrete Under Sulfate Attack

doi: 10.3724/j.gyjzG23042807

1. School of Civil Engineering of Chongqing University, Chongqing 400045, China;
2. Chongqing City Infrastructure Construction Ltd., Chongqing 400010, China

Received Date: 2023-04-28
Available Online: 2024-10-18

Abstract

Abstract

Sulfate attack is one of the main factors leading to the damage and deterioration of concrete. The prediction of the temporal and spatial distribution of sulfate ions in concrete is the basis of studying the damage and deterioration of concrete. Compared with the macroscopic model, the mesoscopic model can better reflect the actual migration law of sulfate ion in concrete, but there are some problems such as complex modeling and long calculation time. In this paper, concrete was regarded as four composite materials composed of cement mortar, interfacial layer, coarse aggregate and macro defects, and a two-dimensional mesoscopic model of concrete was constructed. Then, the effects of macro and mesoscopic models on numerical simulation were studied and compared, and mesoscopic parameters were defined to make the macroscopic model achieve the simulation effect of the mesoscopic model. The results showed that: 1) the influence of mesoscopic model randomness on sulfate ion diffusion could be eliminated by taking the average value of multiple models; 2) the increase of stone content was accompanied by the deepening of erosion depth and the decrease of sulfate ion concentration at the same location, and this phenomenon was more obvious with the increase of depth; 3) the mesoscopic parameters increased with the increase of stone content.
- sulfate attack,
- mesoscopic model,
- numerical simulation,
- stone content,
- mesoscopic parameter

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References

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