Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying
To identify the impact of drying rate on mechanisms of drying shrinkage, two hardened cement paste (hcp) samples were prepared. Mature samples were dried directly at the target relative humidity (RH), “rapid drying”, or at RH decreasing from 95% step by step till 11%, “gradual drying”. When comparin...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-12-01
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| Series: | Cement |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666549222000263 |
| _version_ | 1811293929588391936 |
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| author | Miki Segawa Abudushalamu Aili Ippei Maruyama |
| author_facet | Miki Segawa Abudushalamu Aili Ippei Maruyama |
| author_sort | Miki Segawa |
| collection | DOAJ |
| description | To identify the impact of drying rate on mechanisms of drying shrinkage, two hardened cement paste (hcp) samples were prepared. Mature samples were dried directly at the target relative humidity (RH), “rapid drying”, or at RH decreasing from 95% step by step till 11%, “gradual drying”. When comparing the relation of mass change versus drying shrinkage, at high RH range over 80%, gradually dried samples showed less mass change for same amount of shrinkage comparing to rapid drying samples. For the range of RH of 80%-40%, the incremental values of both mass change and drying shrinkage were same for two drying methods. The specimens were characterized by XRD, TG-DTA and water vapor sorption isotherms. By combining the results with findings in the literature, we postulated that an additional part of drying shrinkage is activated when dried at high relative humidity for a longer time and we attributed this additional part to gel pores of calcium silicate hydrates. |
| first_indexed | 2024-04-13T05:08:50Z |
| format | Article |
| id | doaj.art-1f4e00cd133f4fb6ad43b939132df0a9 |
| institution | Directory Open Access Journal |
| issn | 2666-5492 |
| language | English |
| last_indexed | 2024-04-13T05:08:50Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cement |
| spelling | doaj.art-1f4e00cd133f4fb6ad43b939132df0a92022-12-22T03:01:05ZengElsevierCement2666-54922022-12-0110100047Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid dryingMiki Segawa0Abudushalamu Aili1Ippei Maruyama2Graduate School of Environmental Studies, Nagoya University, 464-8603, ES bldg.-539, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya city, JapanGraduate School of Environmental Studies, Nagoya University, 464-8603, ES bldg.-539, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya city, JapanGraduate School of Environmental Studies, Nagoya University, 464-8603, ES bldg.-546, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya city, Japan; Graduate School of Engineering, The University of Tokyo, Japan; Corresponding author.To identify the impact of drying rate on mechanisms of drying shrinkage, two hardened cement paste (hcp) samples were prepared. Mature samples were dried directly at the target relative humidity (RH), “rapid drying”, or at RH decreasing from 95% step by step till 11%, “gradual drying”. When comparing the relation of mass change versus drying shrinkage, at high RH range over 80%, gradually dried samples showed less mass change for same amount of shrinkage comparing to rapid drying samples. For the range of RH of 80%-40%, the incremental values of both mass change and drying shrinkage were same for two drying methods. The specimens were characterized by XRD, TG-DTA and water vapor sorption isotherms. By combining the results with findings in the literature, we postulated that an additional part of drying shrinkage is activated when dried at high relative humidity for a longer time and we attributed this additional part to gel pores of calcium silicate hydrates.http://www.sciencedirect.com/science/article/pii/S2666549222000263Drying shrinkageDrying rateCalcium-Silicate-Hydrate (C-S-H)Gel-pore water |
| spellingShingle | Miki Segawa Abudushalamu Aili Ippei Maruyama Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying Cement Drying shrinkage Drying rate Calcium-Silicate-Hydrate (C-S-H) Gel-pore water |
| title | Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| title_full | Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| title_fullStr | Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| title_full_unstemmed | Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| title_short | Comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| title_sort | comparison of shrinkage and mass change of hardened cement paste under gradual drying and rapid drying |
| topic | Drying shrinkage Drying rate Calcium-Silicate-Hydrate (C-S-H) Gel-pore water |
| url | http://www.sciencedirect.com/science/article/pii/S2666549222000263 |
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