Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone
The enhancement of the durability of sulfoaluminate cement (CSA) in marine environments is of great importance. To this end, an investigation was carried out involving the placement of CSA concrete in the tidal zone of Zhairuoshan Island, Zhoushan, China, and subjected to a 20-month marine tidal exp...
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MDPI AG
2023-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/7/2905 |
| _version_ | 1797607479311335424 |
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| author | Xudong Tang Shulin Zhan Qiang Xu Kui He |
| author_facet | Xudong Tang Shulin Zhan Qiang Xu Kui He |
| author_sort | Xudong Tang |
| collection | DOAJ |
| description | The enhancement of the durability of sulfoaluminate cement (CSA) in marine environments is of great importance. To this end, an investigation was carried out involving the placement of CSA concrete in the tidal zone of Zhairuoshan Island, Zhoushan, China, and subjected to a 20-month marine tidal exposure test. The comparison was made with ordinary Portland cement (OPC) concrete to evaluate the effectiveness of the former. The test findings indicate that the compressive strength of both types of concrete is reduced by seawater dry-wet cycling, and the porosity of the surface concrete is increased. However, the compressive strength of CSA concrete is observed to be more stable under long-term drying–wetting cycles. When the ettringite in the CSA surface concrete is decomposed due to carbonization and alkalinity reduction, its products will react with Ca<sup>2+</sup> and SO<sub>4</sub><sup>2−</sup> in seawater to regenerate ettringite to fill in the concrete pores, making the concrete strength more stable and hindering chlorine penetration. Furthermore, CSA concrete exhibits a higher capillary absorption capacity than OPC concrete, which results in chloride accumulation on its surface. However, the diffusion capacity of chloride in CSA concrete is significantly lower than that in OPC concrete. |
| first_indexed | 2024-03-11T05:31:38Z |
| format | Article |
| id | doaj.art-41c5d432e1154feeac67de36494902ee |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T05:31:38Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-41c5d432e1154feeac67de36494902ee2023-11-17T17:06:53ZengMDPI AGMaterials1996-19442023-04-01167290510.3390/ma16072905Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal ZoneXudong Tang0Shulin Zhan1Qiang Xu2Kui He3College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaCollege of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaOcean Academy, Zhejiang University, Zhoushan 316021, ChinaOcean Academy, Zhejiang University, Zhoushan 316021, ChinaThe enhancement of the durability of sulfoaluminate cement (CSA) in marine environments is of great importance. To this end, an investigation was carried out involving the placement of CSA concrete in the tidal zone of Zhairuoshan Island, Zhoushan, China, and subjected to a 20-month marine tidal exposure test. The comparison was made with ordinary Portland cement (OPC) concrete to evaluate the effectiveness of the former. The test findings indicate that the compressive strength of both types of concrete is reduced by seawater dry-wet cycling, and the porosity of the surface concrete is increased. However, the compressive strength of CSA concrete is observed to be more stable under long-term drying–wetting cycles. When the ettringite in the CSA surface concrete is decomposed due to carbonization and alkalinity reduction, its products will react with Ca<sup>2+</sup> and SO<sub>4</sub><sup>2−</sup> in seawater to regenerate ettringite to fill in the concrete pores, making the concrete strength more stable and hindering chlorine penetration. Furthermore, CSA concrete exhibits a higher capillary absorption capacity than OPC concrete, which results in chloride accumulation on its surface. However, the diffusion capacity of chloride in CSA concrete is significantly lower than that in OPC concrete.https://www.mdpi.com/1996-1944/16/7/2905calcium sulfoaluminate cementdrying–wetting cycleschloride penetrationmarine tidal environment |
| spellingShingle | Xudong Tang Shulin Zhan Qiang Xu Kui He Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone Materials calcium sulfoaluminate cement drying–wetting cycles chloride penetration marine tidal environment |
| title | Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone |
| title_full | Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone |
| title_fullStr | Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone |
| title_full_unstemmed | Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone |
| title_short | Mechanical Performance and Chloride Penetration of Calcium Sulfoaluminate Concrete in Marine Tidal Zone |
| title_sort | mechanical performance and chloride penetration of calcium sulfoaluminate concrete in marine tidal zone |
| topic | calcium sulfoaluminate cement drying–wetting cycles chloride penetration marine tidal environment |
| url | https://www.mdpi.com/1996-1944/16/7/2905 |
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