Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion
In this study, the effects of high-sulphur fly ash on the properties of lightweight cement-treated materials (LCMs) immersed in sodium sulphate solutions were studied. The unconfined compressive strength of LCMs corroded by sulphate was tested. The microscopic properties were characterised by X-ray...
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MDPI AG
2020-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/15/5217 |
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| author | Xiaoyuan Wang Pengju Han Xiaoqiang Dong Xiangyu Li Xiaohong Bai Bin He Shiwei Niu Funan Sun |
| author_facet | Xiaoyuan Wang Pengju Han Xiaoqiang Dong Xiangyu Li Xiaohong Bai Bin He Shiwei Niu Funan Sun |
| author_sort | Xiaoyuan Wang |
| collection | DOAJ |
| description | In this study, the effects of high-sulphur fly ash on the properties of lightweight cement-treated materials (LCMs) immersed in sodium sulphate solutions were studied. The unconfined compressive strength of LCMs corroded by sulphate was tested. The microscopic properties were characterised by X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results show that high-sulphur fly ash has an adverse effect on the structural strength of LCMs after corrosion, but when the content of fly ash is less than 75%, the effect of fly ash on the strength is small. A small amount of high-sulphur fly ash can improve the density of the material structure; the internal pore structure of LCMs provides space for the growth of ettringite and other corrosive substances and relieves the expansion pressure. LCMs mixed with high-sulphur fly ash have a certain resistance to sodium sulphate corrosion. |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T18:08:03Z |
| publishDate | 2020-07-01 |
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| spelling | doaj.art-568f5545838843218de0ff0cf94302e62023-11-20T08:19:14ZengMDPI AGApplied Sciences2076-34172020-07-011015521710.3390/app10155217Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate CorrosionXiaoyuan Wang0Pengju Han1Xiaoqiang Dong2Xiangyu Li3Xiaohong Bai4Bin He5Shiwei Niu6Funan Sun7College of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, West Yingze Street 79, Taiyuan 030024, ChinaIn this study, the effects of high-sulphur fly ash on the properties of lightweight cement-treated materials (LCMs) immersed in sodium sulphate solutions were studied. The unconfined compressive strength of LCMs corroded by sulphate was tested. The microscopic properties were characterised by X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results show that high-sulphur fly ash has an adverse effect on the structural strength of LCMs after corrosion, but when the content of fly ash is less than 75%, the effect of fly ash on the strength is small. A small amount of high-sulphur fly ash can improve the density of the material structure; the internal pore structure of LCMs provides space for the growth of ettringite and other corrosive substances and relieves the expansion pressure. LCMs mixed with high-sulphur fly ash have a certain resistance to sodium sulphate corrosion.https://www.mdpi.com/2076-3417/10/15/5217lightweight cement-treated materialshigh-sulphur fly ashsulphate corrosionunconfined compressive strengthX-ray diffractionelectrochemical impedance spectroscopy |
| spellingShingle | Xiaoyuan Wang Pengju Han Xiaoqiang Dong Xiangyu Li Xiaohong Bai Bin He Shiwei Niu Funan Sun Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion Applied Sciences lightweight cement-treated materials high-sulphur fly ash sulphate corrosion unconfined compressive strength X-ray diffraction electrochemical impedance spectroscopy |
| title | Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion |
| title_full | Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion |
| title_fullStr | Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion |
| title_full_unstemmed | Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion |
| title_short | Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion |
| title_sort | influences of high sulphur fly ash on the properties of lightweight cement treated materials subjected to sulphate corrosion |
| topic | lightweight cement-treated materials high-sulphur fly ash sulphate corrosion unconfined compressive strength X-ray diffraction electrochemical impedance spectroscopy |
| url | https://www.mdpi.com/2076-3417/10/15/5217 |
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