Experimental Study on Gaseous Moisture Absorption and Swelling of Red-Bed Mudstone in Central Sichuan, China under Different Relative Humidity Environments
文献类型：期刊论文
| 作者 | Yu, Fei1; Tong, Kaiwen1,2; Fu, Zhenghao3; Dai, Zhangjun1; Li, Jian1; Huang, Kang1,2 |
| 刊名 | SUSTAINABILITY
 |
| 出版日期 | 2023-08-01 |
| 卷号 | 15期号:15页码:20 |
| 关键词 | red-bed mudstone gaseous moisture absorption swelling relative humidity |
| DOI | 10.3390/su151512063 |
| 英文摘要 | Aiming to resolve the engineering hazards caused by the long-term micro-swelling of red-bed mudstone, gaseous moisture absorption-swelling tests under four ambient humidities were conducted (60%, 70%, 85% and 99%) by developing a set of experimental devices. Based on the moisture absorption characteristics of mudstone, the effects of a vapor pressure gradient on the equilibrium time, moisture absorption rate and swelling rate were discussed. Combined with its mineral composition and pore structure, the correlation mechanism between gaseous moisture absorption and swelling was explained in depth. The experimental results suggested that the whole process was long-term and slow. The swelling rate was lower than the moisture absorption rate by two orders of magnitude. As a result, the duration of a stable swelling strain was two orders of magnitude higher than that of a stable moisture absorption. The characteristic curve of moisture absorption went through three stages: the rapid stage, dominated by crystal layer adsorption; the intermittent expansion stage, dominated by adsorbed water film; and the decelerated stage, dominated by capillary condensation. In the intermittent expansion stage, as the relative humidity declined, the duration of an intermittency increased, and the number of intermittencies decreased. The evolution of the swelling rate obviously lagged the proportion of moisture absorption. This hysteresis effect reached its maximum when the moisture absorption transitioned from the intermittent expansion stage to the decelerated stage. Moreover, the equilibrium time, moisture absorption ratio and swelling strain all had a non-linear proportional relationship with the relative humidity. In this case, the critical value was 85%. Finally, a unified mathematical expression for the gaseous moisture absorption curve was acquired and the relationship between the swelling strain and the increment of moisture content was fitted; this will provide the necessary research basis for a subsequent simulation of its volume change under changing ambient humidity. |
| 资助项目 | National Natural Science Foundation of China[42172308] ; Youth Innovation Promotion Association CAS[2022331] |
| WOS研究方向 | Science & Technology - Other Topics ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001045726000001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39153]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Tong, Kaiwen |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Wuhan Univ Sci & Technol, Sch Urban Construct, Wuhan 430065, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Fei,Tong, Kaiwen,Fu, Zhenghao,et al. Experimental Study on Gaseous Moisture Absorption and Swelling of Red-Bed Mudstone in Central Sichuan, China under Different Relative Humidity Environments[J]. SUSTAINABILITY,2023,15(15):20. |
| APA | Yu, Fei,Tong, Kaiwen,Fu, Zhenghao,Dai, Zhangjun,Li, Jian,&Huang, Kang.(2023).Experimental Study on Gaseous Moisture Absorption and Swelling of Red-Bed Mudstone in Central Sichuan, China under Different Relative Humidity Environments.SUSTAINABILITY,15(15),20. |
| MLA | Yu, Fei,et al."Experimental Study on Gaseous Moisture Absorption and Swelling of Red-Bed Mudstone in Central Sichuan, China under Different Relative Humidity Environments".SUSTAINABILITY 15.15(2023):20. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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