Multiscale poromechanics of wet cement paste
© 2019 National Academy of Sciences. All rights reserved. Capillary effects, such as imbibition drying cycles, impact the mechanics of granular systems over time. A multiscale poromechanics framework was applied to cement paste, which is the most common building material, experiencing broad humidity...
| Những tác giả chính: | , , , , |
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| Định dạng: | Bài viết |
| Ngôn ngữ: | English |
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Proceedings of the National Academy of Sciences
2021
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| Truy cập trực tuyến: | https://hdl.handle.net/1721.1/135174 |
| _version_ | 1826218055524417536 |
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| author | Zhou, Tingtao Ioannidou, Katerina Ulm, Franz-Josef Bazant, Martin Z Pellenq, RJ-M |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Zhou, Tingtao Ioannidou, Katerina Ulm, Franz-Josef Bazant, Martin Z Pellenq, RJ-M |
| author_sort | Zhou, Tingtao |
| collection | MIT |
| description | © 2019 National Academy of Sciences. All rights reserved. Capillary effects, such as imbibition drying cycles, impact the mechanics of granular systems over time. A multiscale poromechanics framework was applied to cement paste, which is the most common building material, experiencing broad humidity variations over the lifetime of infrastructure. First, the liquid density distribution at intermediate to high relative humidity is obtained using a lattice gas density functional method together with a realistic nanogranular model of cement hydrates. The calculated adsorption/desorption isotherms and pore size distributions are discussed and compare well with nitrogen and water experiments. The standard method for pore size distribution determination from desorption data is evaluated. Second, the integration of the Korteweg liquid stress field around each cement hydrate particle provided the capillary forces at the nanoscale. The cement mesoscale structure was relaxed under the action of the capillary forces. Local irreversible deformations of the cement nanograins assembly were identified due to liquid-solid interactions. The spatial correlations of the nonaffine displacements extend to a few tens of nanometers. Third, the Love-Weber method provided the homogenized liquid stress at the micrometer scale. The homogenization length coincided with the spatial correlation length of nonaffine displacements. Our results on the solid response to capillary stress field suggest that the micrometer-scale texture is not affected by mild drying, while nanoscale irreversible deformations still occur. These results pave the way for understanding capillary phenomenainduced stresses in heterogeneous porous media ranging from construction materials to hydrogels and living systems. |
| first_indexed | 2024-09-23T17:13:26Z |
| format | Article |
| id | mit-1721.1/135174 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:13:26Z |
| publishDate | 2021 |
| publisher | Proceedings of the National Academy of Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1351742023-03-24T19:44:50Z Multiscale poromechanics of wet cement paste Zhou, Tingtao Ioannidou, Katerina Ulm, Franz-Josef Bazant, Martin Z Pellenq, RJ-M Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Massachusetts Institute of Technology. Department of Mathematics Massachusetts Institute of Technology. Department of Chemical Engineering © 2019 National Academy of Sciences. All rights reserved. Capillary effects, such as imbibition drying cycles, impact the mechanics of granular systems over time. A multiscale poromechanics framework was applied to cement paste, which is the most common building material, experiencing broad humidity variations over the lifetime of infrastructure. First, the liquid density distribution at intermediate to high relative humidity is obtained using a lattice gas density functional method together with a realistic nanogranular model of cement hydrates. The calculated adsorption/desorption isotherms and pore size distributions are discussed and compare well with nitrogen and water experiments. The standard method for pore size distribution determination from desorption data is evaluated. Second, the integration of the Korteweg liquid stress field around each cement hydrate particle provided the capillary forces at the nanoscale. The cement mesoscale structure was relaxed under the action of the capillary forces. Local irreversible deformations of the cement nanograins assembly were identified due to liquid-solid interactions. The spatial correlations of the nonaffine displacements extend to a few tens of nanometers. Third, the Love-Weber method provided the homogenized liquid stress at the micrometer scale. The homogenization length coincided with the spatial correlation length of nonaffine displacements. Our results on the solid response to capillary stress field suggest that the micrometer-scale texture is not affected by mild drying, while nanoscale irreversible deformations still occur. These results pave the way for understanding capillary phenomenainduced stresses in heterogeneous porous media ranging from construction materials to hydrogels and living systems. 2021-10-27T20:11:06Z 2021-10-27T20:11:06Z 2019 2019-08-14T13:05:55Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135174 en 10.1073/pnas.1901160116 Proceedings of the National Academy of Sciences of the United States of America Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Proceedings of the National Academy of Sciences PNAS |
| spellingShingle | Zhou, Tingtao Ioannidou, Katerina Ulm, Franz-Josef Bazant, Martin Z Pellenq, RJ-M Multiscale poromechanics of wet cement paste |
| title | Multiscale poromechanics of wet cement paste |
| title_full | Multiscale poromechanics of wet cement paste |
| title_fullStr | Multiscale poromechanics of wet cement paste |
| title_full_unstemmed | Multiscale poromechanics of wet cement paste |
| title_short | Multiscale poromechanics of wet cement paste |
| title_sort | multiscale poromechanics of wet cement paste |
| url | https://hdl.handle.net/1721.1/135174 |
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