Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment
To improve the ability of concrete structures to resist freeze-thaw damage in cold environments, explore the effect and mechanism of nano-metakaolin (NMK) on frost resistance of concrete. And make up for the deficiencies in the mechanical properties and deformation process of na-no-metakaolin concre...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/12/9/1431 |
| _version_ | 1827662611736428544 |
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| author | Shiyi Zhang Yingfang Fan Surendra P. Shah |
| author_facet | Shiyi Zhang Yingfang Fan Surendra P. Shah |
| author_sort | Shiyi Zhang |
| collection | DOAJ |
| description | To improve the ability of concrete structures to resist freeze-thaw damage in cold environments, explore the effect and mechanism of nano-metakaolin (NMK) on frost resistance of concrete. And make up for the deficiencies in the mechanical properties and deformation process of na-no-metakaolin concrete in freeze-thaw environments. Rapid freeze-thaw cycle experiment was car-ried out to detect the deterioration law of concrete. Physical and mechanical properties under freeze-thaw environment was measured. The modification mechanism of nano-metakaolin on con-crete frost resistance from micro and meso scales was analyzed. The effect of freeze-thaw damage on nano-metakaolin concrete was characterized. The influence law of stress strain is established, and the meso-statistical damage constitutive model of nano-metakaolin concrete under freeze-thaw action is established. The results show that: Compared with other nano-clays, adding 5% nano-metakaolin can effectively slow down concrete’s freeze-thaw cracking and crack propagation. After 125 freeze-thaw cycles, the surface crack width of concrete mixed with 5% nano-metakaolin is only 0.1mm. Without freeze-thaw cycles, the compressive strength of concrete mixed with 3% nano-metakaolin is the highest, which is 28.75% higher than that of ordinary concrete; after 125 freeze-thaw cycles, the loss rate of compressive strength of concrete mixed with 5% nano-metakaolin was 12.07%. After 125 freeze-thaw cycles, the peak strain is 0.45 times that of concrete without NMK, and the peak stress is 3 times that of concrete without NMK. |
| first_indexed | 2024-03-10T00:31:23Z |
| format | Article |
| id | doaj.art-429e8ed535cc48768471bd29f844ba43 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T00:31:23Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-429e8ed535cc48768471bd29f844ba432023-11-23T15:24:31ZengMDPI AGBuildings2075-53092022-09-01129143110.3390/buildings12091431Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold EnvironmentShiyi Zhang0Yingfang Fan1Surendra P. Shah2Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, ChinaInstitute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, ChinaDepartment of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USATo improve the ability of concrete structures to resist freeze-thaw damage in cold environments, explore the effect and mechanism of nano-metakaolin (NMK) on frost resistance of concrete. And make up for the deficiencies in the mechanical properties and deformation process of na-no-metakaolin concrete in freeze-thaw environments. Rapid freeze-thaw cycle experiment was car-ried out to detect the deterioration law of concrete. Physical and mechanical properties under freeze-thaw environment was measured. The modification mechanism of nano-metakaolin on con-crete frost resistance from micro and meso scales was analyzed. The effect of freeze-thaw damage on nano-metakaolin concrete was characterized. The influence law of stress strain is established, and the meso-statistical damage constitutive model of nano-metakaolin concrete under freeze-thaw action is established. The results show that: Compared with other nano-clays, adding 5% nano-metakaolin can effectively slow down concrete’s freeze-thaw cracking and crack propagation. After 125 freeze-thaw cycles, the surface crack width of concrete mixed with 5% nano-metakaolin is only 0.1mm. Without freeze-thaw cycles, the compressive strength of concrete mixed with 3% nano-metakaolin is the highest, which is 28.75% higher than that of ordinary concrete; after 125 freeze-thaw cycles, the loss rate of compressive strength of concrete mixed with 5% nano-metakaolin was 12.07%. After 125 freeze-thaw cycles, the peak strain is 0.45 times that of concrete without NMK, and the peak stress is 3 times that of concrete without NMK.https://www.mdpi.com/2075-5309/12/9/1431NMKcompressive strengthfrost resistancedamage and deformationstress-strain curve |
| spellingShingle | Shiyi Zhang Yingfang Fan Surendra P. Shah Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment Buildings NMK compressive strength frost resistance damage and deformation stress-strain curve |
| title | Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment |
| title_full | Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment |
| title_fullStr | Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment |
| title_full_unstemmed | Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment |
| title_short | Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment |
| title_sort | study on deformation characteristics and damage model of nmk concrete under cold environment |
| topic | NMK compressive strength frost resistance damage and deformation stress-strain curve |
| url | https://www.mdpi.com/2075-5309/12/9/1431 |
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