Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions
Sulfate induced degradation of concrete brings great damage to concrete structures in saline or offshore areas. The degradation mechanism of cast-in-situ concrete still remains unclear. This paper investigates the degradation process and corresponding mechanism of cast-in-situ concrete when immersed...
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/14/3179 |
| _version_ | 1797562311874969600 |
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| author | Gaowen Zhao Mei Shi Mengzhen Guo Henghui Fan |
| author_facet | Gaowen Zhao Mei Shi Mengzhen Guo Henghui Fan |
| author_sort | Gaowen Zhao |
| collection | DOAJ |
| description | Sulfate induced degradation of concrete brings great damage to concrete structures in saline or offshore areas. The degradation mechanism of cast-in-situ concrete still remains unclear. This paper investigates the degradation process and corresponding mechanism of cast-in-situ concrete when immersed in sulfate-rich corrosive environments. Concrete samples with different curing conditions were prepared and immersed in sulfate solutions for 12 months to simulate the corrosion of precast and cast-in-situ concrete structures, respectively. Tests regarding the changes of physical, chemical, and mechanical properties of concrete samples were conducted and recorded continuously during the immersion. Micro-structural and mineral methods were performed to analyze the changes of concrete samples after immersion. Results indicate that the corrosion process of cast-in-situ concrete is much faster than the degradation of precast concrete. Chemical attack is the main cause of degradation for both precast and cast-in-situ concrete. Concrete in the environment with higher sulfate concentration suffers more severe degradation. The water/cement ratio has a significant influence on the durability of concrete. A lower water/cement ratio results in obviously better resistance against sulfate attack for both precast and cast-in-situ concrete. |
| first_indexed | 2024-03-10T18:26:29Z |
| format | Article |
| id | doaj.art-335e07308f7448738ad6aee187e754cb |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T18:26:29Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-335e07308f7448738ad6aee187e754cb2023-11-20T06:57:24ZengMDPI AGMaterials1996-19442020-07-011314317910.3390/ma13143179Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing ConditionsGaowen Zhao0Mei Shi1Mengzhen Guo2Henghui Fan3School of Highway, Chang’an University, Xi’an 710064, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaCollege of Water Conservancy and Architectural Engineering, Northwest A&F University, Yangling 712100, ChinaSulfate induced degradation of concrete brings great damage to concrete structures in saline or offshore areas. The degradation mechanism of cast-in-situ concrete still remains unclear. This paper investigates the degradation process and corresponding mechanism of cast-in-situ concrete when immersed in sulfate-rich corrosive environments. Concrete samples with different curing conditions were prepared and immersed in sulfate solutions for 12 months to simulate the corrosion of precast and cast-in-situ concrete structures, respectively. Tests regarding the changes of physical, chemical, and mechanical properties of concrete samples were conducted and recorded continuously during the immersion. Micro-structural and mineral methods were performed to analyze the changes of concrete samples after immersion. Results indicate that the corrosion process of cast-in-situ concrete is much faster than the degradation of precast concrete. Chemical attack is the main cause of degradation for both precast and cast-in-situ concrete. Concrete in the environment with higher sulfate concentration suffers more severe degradation. The water/cement ratio has a significant influence on the durability of concrete. A lower water/cement ratio results in obviously better resistance against sulfate attack for both precast and cast-in-situ concrete.https://www.mdpi.com/1996-1944/13/14/3179cast-in-situ concretedegradation mechanismsulfate attacksulfate diffusion |
| spellingShingle | Gaowen Zhao Mei Shi Mengzhen Guo Henghui Fan Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions Materials cast-in-situ concrete degradation mechanism sulfate attack sulfate diffusion |
| title | Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions |
| title_full | Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions |
| title_fullStr | Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions |
| title_full_unstemmed | Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions |
| title_short | Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions |
| title_sort | degradation mechanism of concrete subjected to external sulfate attack comparison of different curing conditions |
| topic | cast-in-situ concrete degradation mechanism sulfate attack sulfate diffusion |
| url | https://www.mdpi.com/1996-1944/13/14/3179 |
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