Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect
Water and water transfer are the keys of the concrete durability problem; the non-uniform moisture transfer caused by the concrete micro–meso structure has a great effect on the drying shrinkage crack, transfers of inimical ions, etc. For the non-uniform moisture transfer problem, a multi-scale conc...
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MDPI AG
2025-02-01
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| Series: | Applied Sciences |
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| author | Xiaogang Zhang Shuhua Zhang Bofu Chen Bin Tian Xiaochun Lu Bobo Xiong Zhao Pan |
| author_facet | Xiaogang Zhang Shuhua Zhang Bofu Chen Bin Tian Xiaochun Lu Bobo Xiong Zhao Pan |
| author_sort | Xiaogang Zhang |
| collection | DOAJ |
| description | Water and water transfer are the keys of the concrete durability problem; the non-uniform moisture transfer caused by the concrete micro–meso structure has a great effect on the drying shrinkage crack, transfers of inimical ions, etc. For the non-uniform moisture transfer problem, a multi-scale concrete moisture diffusion coefficient model which can consider the effect of Knudsen diffusion was established and verified based on the moisture transfer mechanism of porous medium and the concrete micro–meso structure characteristics. The effects of pore structure, the interfacial transition zone, and aggregate on the concrete moisture diffusion coefficient were studied based on the model, and the non-uniform moisture transfer characteristics and differences in concrete wetting and drying were analyzed via simulations. The results show that the moisture transfers more easily via the pores ranging from 10 nm to 100 nm, the effect of Knudsen diffusion increases with the increasing water-to-cement ratio and decreases with the increasing relative moisture, and Knudsen diffusion is also an effect factor which causes the moisture diffusion coefficient to increase with the increase in moisture. Moisture transfers more easily via the interfacial transition zone at the meso-level and causes a “flow around” phenomenon. The “S” growth relation between the moisture diffusion coefficient and relative moisture can consider the differences in the moisture diffusion coefficient under wetting and drying conditions to a certain extent, which makes concrete wet faster than dry. In addition, the jumping growth of the moisture diffusion coefficient in the relation also leads to an “inflection point” in the concrete moisture distribution. |
| format | Article |
| id | doaj-art-a4a6515f8bee4de7881fca22ef6b7a66 |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-a4a6515f8bee4de7881fca22ef6b7a662025-08-20T03:12:10ZengMDPI AGApplied Sciences2076-34172025-02-01154177410.3390/app15041774Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure EffectXiaogang Zhang0Shuhua Zhang1Bofu Chen2Bin Tian3Xiaochun Lu4Bobo Xiong5Zhao Pan6College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaThe Seventh Geological Brigade of Hubei Geological Bureau, Yichang 443000, ChinaCollege of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaCollege of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaCollege of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaCollege of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaCollege of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, ChinaWater and water transfer are the keys of the concrete durability problem; the non-uniform moisture transfer caused by the concrete micro–meso structure has a great effect on the drying shrinkage crack, transfers of inimical ions, etc. For the non-uniform moisture transfer problem, a multi-scale concrete moisture diffusion coefficient model which can consider the effect of Knudsen diffusion was established and verified based on the moisture transfer mechanism of porous medium and the concrete micro–meso structure characteristics. The effects of pore structure, the interfacial transition zone, and aggregate on the concrete moisture diffusion coefficient were studied based on the model, and the non-uniform moisture transfer characteristics and differences in concrete wetting and drying were analyzed via simulations. The results show that the moisture transfers more easily via the pores ranging from 10 nm to 100 nm, the effect of Knudsen diffusion increases with the increasing water-to-cement ratio and decreases with the increasing relative moisture, and Knudsen diffusion is also an effect factor which causes the moisture diffusion coefficient to increase with the increase in moisture. Moisture transfers more easily via the interfacial transition zone at the meso-level and causes a “flow around” phenomenon. The “S” growth relation between the moisture diffusion coefficient and relative moisture can consider the differences in the moisture diffusion coefficient under wetting and drying conditions to a certain extent, which makes concrete wet faster than dry. In addition, the jumping growth of the moisture diffusion coefficient in the relation also leads to an “inflection point” in the concrete moisture distribution.https://www.mdpi.com/2076-3417/15/4/1774concretemoisture transferKnudsen diffusionmicro–meso structuremoisture diffusion coefficient |
| spellingShingle | Xiaogang Zhang Shuhua Zhang Bofu Chen Bin Tian Xiaochun Lu Bobo Xiong Zhao Pan Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect Applied Sciences concrete moisture transfer Knudsen diffusion micro–meso structure moisture diffusion coefficient |
| title | Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect |
| title_full | Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect |
| title_fullStr | Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect |
| title_full_unstemmed | Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect |
| title_short | Study of Concrete Moisture Transfer Characteristics in the Presence of the Concrete Micro–Meso Structure Effect |
| title_sort | study of concrete moisture transfer characteristics in the presence of the concrete micro meso structure effect |
| topic | concrete moisture transfer Knudsen diffusion micro–meso structure moisture diffusion coefficient |
| url | https://www.mdpi.com/2076-3417/15/4/1774 |
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