Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash
The macroscopic morphology characteristics, pore structure characteristics, and microfracture morphology of concrete with fly ash subjected to the freeze-thaw-creep effect were analyzed via scanning electron microscopy (SEM). The results revealed that the macrosection of a specimen subjected to free...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6641419 |
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| _version_ | 1832565906112249856 |
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| author | Bing Li Lian-ying Zhang Ming Li Hai Pu Chao Ma Pei-tao Qiu |
| author_facet | Bing Li Lian-ying Zhang Ming Li Hai Pu Chao Ma Pei-tao Qiu |
| author_sort | Bing Li |
| collection | DOAJ |
| description | The macroscopic morphology characteristics, pore structure characteristics, and microfracture morphology of concrete with fly ash subjected to the freeze-thaw-creep effect were analyzed via scanning electron microscopy (SEM). The results revealed that the macrosection of a specimen subjected to freeze-thaw cycling evolves from a regular to an irregular morphology in which the degree of fragmentation increases. Four specimen pore structure types characterized by single holes, nonconnected hole clusters, connected hole clusters, and fly ash holes, respectively, were identified. The microfracture morphology of the concrete was found to include five types of brittle fractures—river, step, cascade, hemispherical, and irregular patterns—and two types of ductile fractures—dimple and peak forest patterns. Two sets of experiments in which (1) the fly ash content (m=35%) was kept constant and the number of freeze-thaw cycles increased, and (2) the number of freeze-thaw cycles (n=120) was kept constant, and the fly ash content was increased were carried out. In both cases, the number of connected hole clusters increased and a surrounding skeleton structure with a needle filamentous or flaky appearance was produced. In addition, the degree of deterioration of the pore structure increased and the fracture features changed from brittle to ductile. |
| format | Article |
| id | doaj-art-13ee38536f7140f391e1c80cdd566208 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-13ee38536f7140f391e1c80cdd5662082025-02-03T01:05:30ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66414196641419Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly AshBing Li0Lian-ying Zhang1Ming Li2Hai Pu3Chao Ma4Pei-tao Qiu5School of Civil Engineering, Xuzhou Institute of Technology, Xuzhou, 221008 Jiangsu, ChinaSchool of Civil Engineering, Xuzhou Institute of Technology, Xuzhou, 221008 Jiangsu, ChinaState Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221008 Jiangsu, ChinaState Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221008 Jiangsu, ChinaSchool of Civil Engineering, Xuzhou Institute of Technology, Xuzhou, 221008 Jiangsu, ChinaSchool of Civil Engineering, Xuzhou Institute of Technology, Xuzhou, 221008 Jiangsu, ChinaThe macroscopic morphology characteristics, pore structure characteristics, and microfracture morphology of concrete with fly ash subjected to the freeze-thaw-creep effect were analyzed via scanning electron microscopy (SEM). The results revealed that the macrosection of a specimen subjected to freeze-thaw cycling evolves from a regular to an irregular morphology in which the degree of fragmentation increases. Four specimen pore structure types characterized by single holes, nonconnected hole clusters, connected hole clusters, and fly ash holes, respectively, were identified. The microfracture morphology of the concrete was found to include five types of brittle fractures—river, step, cascade, hemispherical, and irregular patterns—and two types of ductile fractures—dimple and peak forest patterns. Two sets of experiments in which (1) the fly ash content (m=35%) was kept constant and the number of freeze-thaw cycles increased, and (2) the number of freeze-thaw cycles (n=120) was kept constant, and the fly ash content was increased were carried out. In both cases, the number of connected hole clusters increased and a surrounding skeleton structure with a needle filamentous or flaky appearance was produced. In addition, the degree of deterioration of the pore structure increased and the fracture features changed from brittle to ductile.http://dx.doi.org/10.1155/2021/6641419 |
| spellingShingle | Bing Li Lian-ying Zhang Ming Li Hai Pu Chao Ma Pei-tao Qiu Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash Geofluids |
| title | Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash |
| title_full | Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash |
| title_fullStr | Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash |
| title_full_unstemmed | Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash |
| title_short | Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash |
| title_sort | microstructural features of freezing and thawing creep damages for concrete mixed with fly ash |
| url | http://dx.doi.org/10.1155/2021/6641419 |
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