Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion
To clarify the damage mechanism of the layer erosion argillization of concrete eroded by sulfate attack, this study investigates the compressive strength decay characteristics of eroded concrete. It employs ultrasonic velocity, SO42− content, and microhardness testing methods to comprehensively eval...
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| Language: | English |
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425008506 |
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| author | Zhongzhe Zhang Hua Yin Shuai Hao Meiqi Cao Yumeng Du Yongsheng Ji |
| author_facet | Zhongzhe Zhang Hua Yin Shuai Hao Meiqi Cao Yumeng Du Yongsheng Ji |
| author_sort | Zhongzhe Zhang |
| collection | DOAJ |
| description | To clarify the damage mechanism of the layer erosion argillization of concrete eroded by sulfate attack, this study investigates the compressive strength decay characteristics of eroded concrete. It employs ultrasonic velocity, SO42− content, and microhardness testing methods to comprehensively evaluate the lamination and deterioration processes of concrete at different erosion ages. Additionally, nano-indentation and XRD are utilized to examine the alkali dissipation and deterioration mechanisms of concrete under sulfate attack. The results reveal that sulfate attack in concrete is not a uniform infiltration process but rather a progressive layered erosion that advances inward over time. As the erosion age increases, the C–S–H gel in the affected concrete transitions from a high-density state to a low-density state. The continuous consumption of Ca(OH)2 by MgSO4 induced erosion is identified as the primary driver of alkali depletion and subsequent deterioration. When the alkalinity of the cement matrix can no longer stabilize the C–S–H gel, the external C–S–H gel between cement particles begins to decompose, ultimately leading to the fracturing and disintegration of the cement matrix structure. |
| format | Article |
| id | doaj-art-b6d570d3d1604d02bb389fd5f6da7f25 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-b6d570d3d1604d02bb389fd5f6da7f252025-08-20T02:25:35ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01362849286210.1016/j.jmrt.2025.04.029Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosionZhongzhe Zhang0Hua Yin1Shuai Hao2Meiqi Cao3Yumeng Du4Yongsheng Ji5Institute of Transportation, Inner Mongolia University, Hohhot, 010070, China; Key Laboratory of Green Resource Utilization of Civil Engineering Waste at Universities of Inner Mongolia Autonomous Region, Hohhot, 010020, ChinaInstitute of Transportation, Inner Mongolia University, Hohhot, 010070, China; Key Laboratory of Green Resource Utilization of Civil Engineering Waste at Universities of Inner Mongolia Autonomous Region, Hohhot, 010020, China; Corresponding author. Institute of Transportation, Inner Mongolia University, Hohhot, 010070, China.School of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China; Corresponding author. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.Institute of Transportation, Inner Mongolia University, Hohhot, 010070, ChinaInstitute of Transportation, Inner Mongolia University, Hohhot, 010070, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground of Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Corresponding author. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground of Engineering, China University of Mining and Technology, Xuzhou, 221116, China.To clarify the damage mechanism of the layer erosion argillization of concrete eroded by sulfate attack, this study investigates the compressive strength decay characteristics of eroded concrete. It employs ultrasonic velocity, SO42− content, and microhardness testing methods to comprehensively evaluate the lamination and deterioration processes of concrete at different erosion ages. Additionally, nano-indentation and XRD are utilized to examine the alkali dissipation and deterioration mechanisms of concrete under sulfate attack. The results reveal that sulfate attack in concrete is not a uniform infiltration process but rather a progressive layered erosion that advances inward over time. As the erosion age increases, the C–S–H gel in the affected concrete transitions from a high-density state to a low-density state. The continuous consumption of Ca(OH)2 by MgSO4 induced erosion is identified as the primary driver of alkali depletion and subsequent deterioration. When the alkalinity of the cement matrix can no longer stabilize the C–S–H gel, the external C–S–H gel between cement particles begins to decompose, ultimately leading to the fracturing and disintegration of the cement matrix structure.http://www.sciencedirect.com/science/article/pii/S2238785425008506Sulfate attackLayer erosion argillizationAlkali loss dispersionDeterioration promotion |
| spellingShingle | Zhongzhe Zhang Hua Yin Shuai Hao Meiqi Cao Yumeng Du Yongsheng Ji Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion Journal of Materials Research and Technology Sulfate attack Layer erosion argillization Alkali loss dispersion Deterioration promotion |
| title | Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion |
| title_full | Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion |
| title_fullStr | Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion |
| title_full_unstemmed | Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion |
| title_short | Study on the advancement process of alkali loss and deterioration of concrete under MgSO4 erosion |
| title_sort | study on the advancement process of alkali loss and deterioration of concrete under mgso4 erosion |
| topic | Sulfate attack Layer erosion argillization Alkali loss dispersion Deterioration promotion |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425008506 |
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