Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics
In this paper, the performance of a gas barrier that consisted of polyacrylamide (PAM)-modified compacted clayey soil was experimentally explored. The moisture content and water loss characteristics of the tested soils were adopted as indicative indices of water retention capacity (WRC). The gas per...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/16/8379 |
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| author | Yu-Zhang Bi Jia-Ming Wen Hao-Liang Wu Yan-Jun Du |
| author_facet | Yu-Zhang Bi Jia-Ming Wen Hao-Liang Wu Yan-Jun Du |
| author_sort | Yu-Zhang Bi |
| collection | DOAJ |
| description | In this paper, the performance of a gas barrier that consisted of polyacrylamide (PAM)-modified compacted clayey soil was experimentally explored. The moisture content and water loss characteristics of the tested soils were adopted as indicative indices of water retention capacity (WRC). The gas permeability (K<sub>p</sub>) and gas diffusion coefficient (D<sub>p</sub>) of the modified compacted clays were evaluated via gas permeability and gas diffusion tests. The test results showed that the moisture content of the modified compacted clay samples subjected to drying tests increased with increasing polyacrylamide content. K<sub>p</sub> and D<sub>p</sub> decreased with increasing PAM content. Compared with 0.2% PAM content, the K<sub>p</sub> of the sample with 1.0% PAM was reduced by ten times, and the D<sub>p</sub> was reduced to ~35%. Compared to the unmodified clay, the liquid limit of the PAM-modified clay increased by 45~55%. Comparison of the liquid limit tests between this study and previous studies revealed that the liquid limit ratio of the zwitterionic polyacrylamide (ZP)-modified soil was much higher than the other material-modified soils. The results of this study are useful to facilitate the application of modified compacted clays as gas barrier materials at industrial contaminated sites. |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T10:01:22Z |
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| spelling | doaj.art-4b05102b346f412882d162d873bfebd92023-12-01T23:22:57ZengMDPI AGApplied Sciences2076-34172022-08-011216837910.3390/app12168379Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion CharacteristicsYu-Zhang Bi0Jia-Ming Wen1Hao-Liang Wu2Yan-Jun Du3Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaJiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaSchool of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, ChinaJiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaIn this paper, the performance of a gas barrier that consisted of polyacrylamide (PAM)-modified compacted clayey soil was experimentally explored. The moisture content and water loss characteristics of the tested soils were adopted as indicative indices of water retention capacity (WRC). The gas permeability (K<sub>p</sub>) and gas diffusion coefficient (D<sub>p</sub>) of the modified compacted clays were evaluated via gas permeability and gas diffusion tests. The test results showed that the moisture content of the modified compacted clay samples subjected to drying tests increased with increasing polyacrylamide content. K<sub>p</sub> and D<sub>p</sub> decreased with increasing PAM content. Compared with 0.2% PAM content, the K<sub>p</sub> of the sample with 1.0% PAM was reduced by ten times, and the D<sub>p</sub> was reduced to ~35%. Compared to the unmodified clay, the liquid limit of the PAM-modified clay increased by 45~55%. Comparison of the liquid limit tests between this study and previous studies revealed that the liquid limit ratio of the zwitterionic polyacrylamide (ZP)-modified soil was much higher than the other material-modified soils. The results of this study are useful to facilitate the application of modified compacted clays as gas barrier materials at industrial contaminated sites.https://www.mdpi.com/2076-3417/12/16/8379compacted claypolyacrylamidegas barrier performancegas permeabilitygas diffusion coefficient |
| spellingShingle | Yu-Zhang Bi Jia-Ming Wen Hao-Liang Wu Yan-Jun Du Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics Applied Sciences compacted clay polyacrylamide gas barrier performance gas permeability gas diffusion coefficient |
| title | Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics |
| title_full | Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics |
| title_fullStr | Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics |
| title_full_unstemmed | Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics |
| title_short | Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics |
| title_sort | evaluation of performance of polyacrylamide modified compacted clay as a gas barrier water retention and gas permeability and diffusion characteristics |
| topic | compacted clay polyacrylamide gas barrier performance gas permeability gas diffusion coefficient |
| url | https://www.mdpi.com/2076-3417/12/16/8379 |
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