Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment
Generally, brick buildings are in the open-air environment year round, and damage to them is aggravated by the effect of repeated freezing and thawing cycles. In order to determine freeze–thaw damage and deterioration mechanism, the initial moisture content of gray brick specimens was set as 20%, 40...
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MDPI AG
2022-02-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/5/1819 |
| _version_ | 1797474595333210112 |
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| author | Jianwei Yue Can Ma Limin Zhao Qingmei Kong Xiangchun Xu Zifa Wang Ying Chen |
| author_facet | Jianwei Yue Can Ma Limin Zhao Qingmei Kong Xiangchun Xu Zifa Wang Ying Chen |
| author_sort | Jianwei Yue |
| collection | DOAJ |
| description | Generally, brick buildings are in the open-air environment year round, and damage to them is aggravated by the effect of repeated freezing and thawing cycles. In order to determine freeze–thaw damage and deterioration mechanism, the initial moisture content of gray brick specimens was set as 20%, 40%, 60%, 80%, 100%. The effects of moisture content and the number of freeze–thaw cycles on the quality, mechanical properties and microstructure of gray brick were investigated by uniaxial compression tests and scanning electron microscopy (SEM) tests. Numerical simulations were applied to model the freezing and thawing process. The results showed that: as the number of freeze–thaw cycles increased, the mass loss rate and peak strength reduction rate of gray brick both increased. The initial moisture content had a greater impact on damage to gray brick due to freeze–thaw; <i>ω</i> = 80% was defined as the limit moisture content of gray brick. Under the repeated action of freeze–thaw cycles, the areas affected by thermal stress were mainly concentrated in the center of the outer surface and the center of the side of gray bricks. The maximum thermal stress after 55 freeze–thaw cycles was 1.522 × 10<sup>−2</sup> MPa. This research results provide a theoretical basis for the prevention and protection of frost damage of brick buildings in a freeze–thaw environment. |
| first_indexed | 2024-03-09T20:32:23Z |
| format | Article |
| id | doaj.art-b486bf967294429ba8e4ef99c4928cee |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T20:32:23Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-b486bf967294429ba8e4ef99c4928cee2023-11-23T23:19:23ZengMDPI AGMaterials1996-19442022-02-01155181910.3390/ma15051819Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw EnvironmentJianwei Yue0Can Ma1Limin Zhao2Qingmei Kong3Xiangchun Xu4Zifa Wang5Ying Chen6School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaGenerally, brick buildings are in the open-air environment year round, and damage to them is aggravated by the effect of repeated freezing and thawing cycles. In order to determine freeze–thaw damage and deterioration mechanism, the initial moisture content of gray brick specimens was set as 20%, 40%, 60%, 80%, 100%. The effects of moisture content and the number of freeze–thaw cycles on the quality, mechanical properties and microstructure of gray brick were investigated by uniaxial compression tests and scanning electron microscopy (SEM) tests. Numerical simulations were applied to model the freezing and thawing process. The results showed that: as the number of freeze–thaw cycles increased, the mass loss rate and peak strength reduction rate of gray brick both increased. The initial moisture content had a greater impact on damage to gray brick due to freeze–thaw; <i>ω</i> = 80% was defined as the limit moisture content of gray brick. Under the repeated action of freeze–thaw cycles, the areas affected by thermal stress were mainly concentrated in the center of the outer surface and the center of the side of gray bricks. The maximum thermal stress after 55 freeze–thaw cycles was 1.522 × 10<sup>−2</sup> MPa. This research results provide a theoretical basis for the prevention and protection of frost damage of brick buildings in a freeze–thaw environment.https://www.mdpi.com/1996-1944/15/5/1819gray brickmoisture contentfreeze–thaw cyclemechanical propertyfreeze–thaw damage |
| spellingShingle | Jianwei Yue Can Ma Limin Zhao Qingmei Kong Xiangchun Xu Zifa Wang Ying Chen Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment Materials gray brick moisture content freeze–thaw cycle mechanical property freeze–thaw damage |
| title | Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment |
| title_full | Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment |
| title_fullStr | Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment |
| title_full_unstemmed | Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment |
| title_short | Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment |
| title_sort | study on deterioration of gray brick with different moisture contents under freeze thaw environment |
| topic | gray brick moisture content freeze–thaw cycle mechanical property freeze–thaw damage |
| url | https://www.mdpi.com/1996-1944/15/5/1819 |
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