Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste
Cement paste has a complex distribution of pores and molecular-scale spaces. This distribution controls the hysteresis of water sorption isotherms and associated bulk dimensional changes (shrinkage). We focus on two locations of evaporable water within the fine structure of pastes, each having uniqu...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/97464 https://orcid.org/0000-0001-5735-0560 https://orcid.org/0000-0002-2727-0137 |
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| author | Pinson, Matthew B. Masoero, Enrico Bonnaud, Patrick A. Manzano, Hegoi Ji, Qing Yip, Sidney Thomas, Jeffrey J. Jennings, Hamlin Manson Bazant, Martin Z Van Vliet, Krystyn J |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Pinson, Matthew B. Masoero, Enrico Bonnaud, Patrick A. Manzano, Hegoi Ji, Qing Yip, Sidney Thomas, Jeffrey J. Jennings, Hamlin Manson Bazant, Martin Z Van Vliet, Krystyn J |
| author_sort | Pinson, Matthew B. |
| collection | MIT |
| description | Cement paste has a complex distribution of pores and molecular-scale spaces. This distribution controls the hysteresis of water sorption isotherms and associated bulk dimensional changes (shrinkage). We focus on two locations of evaporable water within the fine structure of pastes, each having unique properties, and we present applied physics models that capture the hysteresis by dividing drying and rewetting into two related regimes based on relative humidity (RH). We show that a continuum model, incorporating a pore-blocking mechanism for desorption and equilibrium thermodynamics for adsorption, explains well the sorption hysteresis for a paste that remains above approximately 20% RH. In addition, we show with molecular models and experiments that water in spaces of ≲1 nm width evaporates below approximately 20% RH but reenters throughout the entire RH range. This water is responsible for a drying shrinkage hysteresis similar to that of clays but opposite in direction to typical mesoporous glass. Combining the models of these two regimes allows the entire drying and rewetting hysteresis to be reproduced accurately and provides parameters to predict the corresponding dimensional changes. The resulting model can improve the engineering predictions of long-term drying shrinkage accounting also for the history dependence of strain induced by hysteresis. Alternative strategies for quantitative analyses of the microstructure of cement paste based on this mesoscale physical model of water content within porous spaces are discussed. |
| first_indexed | 2024-09-23T13:38:10Z |
| format | Article |
| id | mit-1721.1/97464 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:38:10Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/974642023-02-26T02:09:25Z Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste Pinson, Matthew B. Masoero, Enrico Bonnaud, Patrick A. Manzano, Hegoi Ji, Qing Yip, Sidney Thomas, Jeffrey J. Jennings, Hamlin Manson Bazant, Martin Z Van Vliet, Krystyn J Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Mathematics Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Physics Pinson, Matthew B. Yip, Sidney Bazant, Martin Z. Van Vliet, Krystyn J. Jennings, Hamlin Manson Cement paste has a complex distribution of pores and molecular-scale spaces. This distribution controls the hysteresis of water sorption isotherms and associated bulk dimensional changes (shrinkage). We focus on two locations of evaporable water within the fine structure of pastes, each having unique properties, and we present applied physics models that capture the hysteresis by dividing drying and rewetting into two related regimes based on relative humidity (RH). We show that a continuum model, incorporating a pore-blocking mechanism for desorption and equilibrium thermodynamics for adsorption, explains well the sorption hysteresis for a paste that remains above approximately 20% RH. In addition, we show with molecular models and experiments that water in spaces of ≲1 nm width evaporates below approximately 20% RH but reenters throughout the entire RH range. This water is responsible for a drying shrinkage hysteresis similar to that of clays but opposite in direction to typical mesoporous glass. Combining the models of these two regimes allows the entire drying and rewetting hysteresis to be reproduced accurately and provides parameters to predict the corresponding dimensional changes. The resulting model can improve the engineering predictions of long-term drying shrinkage accounting also for the history dependence of strain induced by hysteresis. Alternative strategies for quantitative analyses of the microstructure of cement paste based on this mesoscale physical model of water content within porous spaces are discussed. Portland Cement Association National Ready Mixed Concrete Association (Research and Education Foundation) Schlumberger Foundation 2015-06-18T13:48:22Z 2015-06-18T13:48:22Z 2015-06 2015-01 2015-06-17T22:00:06Z Article http://purl.org/eprint/type/JournalArticle 2331-7019 http://hdl.handle.net/1721.1/97464 Pinson, Matthew B., et al. "Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste." Phys. Rev. Applied 3, 064009 (June 2015). © 2015 American Physical Society https://orcid.org/0000-0001-5735-0560 https://orcid.org/0000-0002-2727-0137 en http://dx.doi.org/10.1103/PhysRevApplied.3.064009 Physical Review Applied 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Pinson, Matthew B. Masoero, Enrico Bonnaud, Patrick A. Manzano, Hegoi Ji, Qing Yip, Sidney Thomas, Jeffrey J. Jennings, Hamlin Manson Bazant, Martin Z Van Vliet, Krystyn J Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title | Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title_full | Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title_fullStr | Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title_full_unstemmed | Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title_short | Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste |
| title_sort | hysteresis from multiscale porosity modeling water sorption and shrinkage in cement paste |
| url | http://hdl.handle.net/1721.1/97464 https://orcid.org/0000-0001-5735-0560 https://orcid.org/0000-0002-2727-0137 |
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