Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions
Magnesium silicate hydrate (M-S-H) cement, a type of green building material, has poor volume stability (i.e., large shrinkage deformation), which limits its application. As a new type of admixture, the behavior of a shrinkage-reducing admixture (SRA) in M-S-H cement has not been studied. Therefore,...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/4/563 |
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| author | Tingting Zhang Hao Fu Junnan Han |
| author_facet | Tingting Zhang Hao Fu Junnan Han |
| author_sort | Tingting Zhang |
| collection | DOAJ |
| description | Magnesium silicate hydrate (M-S-H) cement, a type of green building material, has poor volume stability (i.e., large shrinkage deformation), which limits its application. As a new type of admixture, the behavior of a shrinkage-reducing admixture (SRA) in M-S-H cement has not been studied. Therefore, in this research, the effect of SRA on the shrinkage properties of the M-S-H cement system was evaluated. The mechanism of SRA was investigated by surface tension measurement, hydration heat testing, thermogravimetric analysis, and pore structure analysis. Experimental results indicate that SRA can reduce the shrinkage of the M-S-H mortar, and the optimal effect is exerted when the dosage is 3.0%, drying shrinkage decreases by 22.6%, and autogenous shrinkage decreases by 60% on day 28. However, it may also adversely affect strength development. The presence of SRA in M-S-H cement can reduce pore solution surface tension, delay hydration, and maintain relative humidity within the slurry, which can be maintained at 82.0% on day 28. It can also increase pore size and porosity. The inhibitory effect of SRA on the shrinkage of M-S-H mortar is valuable for its future practical applications. |
| first_indexed | 2024-03-11T04:42:36Z |
| format | Article |
| id | doaj.art-77d9dec1dc194623b9ed1a4b4dc7b765 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T04:42:36Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-77d9dec1dc194623b9ed1a4b4dc7b7652023-11-17T20:36:27ZengMDPI AGMinerals2075-163X2023-04-0113456310.3390/min13040563Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing ConditionsTingting Zhang0Hao Fu1Junnan Han2Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, ChinaFaculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, ChinaFaculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, ChinaMagnesium silicate hydrate (M-S-H) cement, a type of green building material, has poor volume stability (i.e., large shrinkage deformation), which limits its application. As a new type of admixture, the behavior of a shrinkage-reducing admixture (SRA) in M-S-H cement has not been studied. Therefore, in this research, the effect of SRA on the shrinkage properties of the M-S-H cement system was evaluated. The mechanism of SRA was investigated by surface tension measurement, hydration heat testing, thermogravimetric analysis, and pore structure analysis. Experimental results indicate that SRA can reduce the shrinkage of the M-S-H mortar, and the optimal effect is exerted when the dosage is 3.0%, drying shrinkage decreases by 22.6%, and autogenous shrinkage decreases by 60% on day 28. However, it may also adversely affect strength development. The presence of SRA in M-S-H cement can reduce pore solution surface tension, delay hydration, and maintain relative humidity within the slurry, which can be maintained at 82.0% on day 28. It can also increase pore size and porosity. The inhibitory effect of SRA on the shrinkage of M-S-H mortar is valuable for its future practical applications.https://www.mdpi.com/2075-163X/13/4/563shrinkage-reducing admixturemagnesium silicate hydratedrying shrinkageautogenous shrinkage |
| spellingShingle | Tingting Zhang Hao Fu Junnan Han Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions Minerals shrinkage-reducing admixture magnesium silicate hydrate drying shrinkage autogenous shrinkage |
| title | Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions |
| title_full | Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions |
| title_fullStr | Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions |
| title_full_unstemmed | Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions |
| title_short | Deformation Mechanisms of Magnesium Silicate Hydrate Cement with a Shrinkage-Reducing Admixture under Different Curing Conditions |
| title_sort | deformation mechanisms of magnesium silicate hydrate cement with a shrinkage reducing admixture under different curing conditions |
| topic | shrinkage-reducing admixture magnesium silicate hydrate drying shrinkage autogenous shrinkage |
| url | https://www.mdpi.com/2075-163X/13/4/563 |
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