Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete
The effects of sulfate attack and freeze-thaw alternation on the concrete microstructure were systemically investigated by advanced test methods such as water absorption method, air void analysis, XRD, and SEM. The experimental results indicated that freeze-thaw damage is the major effective factor...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2015/859069 |
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| author | Huaquan Yang Xiaoming Shen Meijuan Rao Xiang Li Xiaodong Wang |
| author_facet | Huaquan Yang Xiaoming Shen Meijuan Rao Xiang Li Xiaodong Wang |
| author_sort | Huaquan Yang |
| collection | DOAJ |
| description | The effects of sulfate attack and freeze-thaw alternation on the concrete microstructure were systemically investigated by advanced test methods such as water absorption method, air void analysis, XRD, and SEM. The experimental results indicated that freeze-thaw damage is the major effective factor in the sulfate attack and freeze-thaw alternation test. In the alternation test, average aperture of capillary pores of specimens was smaller, pores uniformity was better, and water absorption rate was lower than those specimens used in the single freeze-thaw damage test. The average aperture and uniformity of pores could be improved by adding fly ash and slag. Damage was accumulated in many cycles of freeze-thaw and microcracks increased during the test. At the same time, the hydration products of the concrete developed into expansive gypsum, AFt, and TSA without any strength during sulfate attack. The results of the microstructure analysis form XRD and SEM are in accordance with that of AFt, about 3 μm length, around which other hydration products decomposed by C-S-H after sulfate attack resulted in loss of concrete strength. |
| format | Article |
| id | doaj-art-d21ad83bf4124f4d9c2e2ed8fe091dbd |
| institution | OA Journals |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-d21ad83bf4124f4d9c2e2ed8fe091dbd2025-08-20T02:19:42ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422015-01-01201510.1155/2015/859069859069Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of ConcreteHuaquan Yang0Xiaoming Shen1Meijuan Rao2Xiang Li3Xiaodong Wang4Changjiang River Scientific Research Institute, Wuhan 430010, ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaChangjiang River Scientific Research Institute, Wuhan 430010, ChinaChangjiang River Scientific Research Institute, Wuhan 430010, ChinaSchool of Engineering, College of Physical Sciences, University of Aberdeen, Aberdeen AB24 3UE, UKThe effects of sulfate attack and freeze-thaw alternation on the concrete microstructure were systemically investigated by advanced test methods such as water absorption method, air void analysis, XRD, and SEM. The experimental results indicated that freeze-thaw damage is the major effective factor in the sulfate attack and freeze-thaw alternation test. In the alternation test, average aperture of capillary pores of specimens was smaller, pores uniformity was better, and water absorption rate was lower than those specimens used in the single freeze-thaw damage test. The average aperture and uniformity of pores could be improved by adding fly ash and slag. Damage was accumulated in many cycles of freeze-thaw and microcracks increased during the test. At the same time, the hydration products of the concrete developed into expansive gypsum, AFt, and TSA without any strength during sulfate attack. The results of the microstructure analysis form XRD and SEM are in accordance with that of AFt, about 3 μm length, around which other hydration products decomposed by C-S-H after sulfate attack resulted in loss of concrete strength.http://dx.doi.org/10.1155/2015/859069 |
| spellingShingle | Huaquan Yang Xiaoming Shen Meijuan Rao Xiang Li Xiaodong Wang Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete Advances in Materials Science and Engineering |
| title | Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete |
| title_full | Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete |
| title_fullStr | Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete |
| title_full_unstemmed | Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete |
| title_short | Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete |
| title_sort | influence of alternation of sulfate attack and freeze thaw on microstructure of concrete |
| url | http://dx.doi.org/10.1155/2015/859069 |
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