Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure
Calcium sulfoaluminate cement (CSA) is a low-carbon cementitious material that significantly reduces alkalinity and produces calcium hydroxide-free (CH-free) matrix environment in comparison to ordinary Portland cement (OPC). It might be, however, less efficient towards the passivation of steel in c...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/4761854 |
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| author | Meimei Song Qiu Li Ke Wu Yihua Dou |
| author_facet | Meimei Song Qiu Li Ke Wu Yihua Dou |
| author_sort | Meimei Song |
| collection | DOAJ |
| description | Calcium sulfoaluminate cement (CSA) is a low-carbon cementitious material that significantly reduces alkalinity and produces calcium hydroxide-free (CH-free) matrix environment in comparison to ordinary Portland cement (OPC). It might be, however, less efficient towards the passivation of steel in concrete and further investigation before widespread adoption is required. In this project, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX) on polished samples was employed to provide the interfacial characterization of steel reinforced CSA concrete and study the relationship of interfacial quality and corrosion resistance of the embedded steel. The galvanostatic polarization behavior indicates that the steel embedded in CSA concrete remains passive for 28 days in absence of Cl− ions and carbonation. Microstructure analysis has shown that there is an Al-enriched layer at interfacial zone in CSA concrete with the main hydration product of AH3, which is also alkaline and is expected to improve the steel passivity. Furthermore, the interfacial zone has markedly reduced porosity compared to the bulk matrix, which leads to reduced possibility of current flow between anode and cathode and therefore improves the corrosion resistance of the embedded reinforcement. |
| format | Article |
| id | doaj-art-69616258681043b0b1c57d88ab140241 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-69616258681043b0b1c57d88ab1402412025-02-03T01:24:57ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/47618544761854Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial MicrostructureMeimei Song0Qiu Li1Ke Wu2Yihua Dou3School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaState Key Laboratories of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Mechanical and Materials Engineering, University College Dublin, Dublin, IrelandSchool of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCalcium sulfoaluminate cement (CSA) is a low-carbon cementitious material that significantly reduces alkalinity and produces calcium hydroxide-free (CH-free) matrix environment in comparison to ordinary Portland cement (OPC). It might be, however, less efficient towards the passivation of steel in concrete and further investigation before widespread adoption is required. In this project, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX) on polished samples was employed to provide the interfacial characterization of steel reinforced CSA concrete and study the relationship of interfacial quality and corrosion resistance of the embedded steel. The galvanostatic polarization behavior indicates that the steel embedded in CSA concrete remains passive for 28 days in absence of Cl− ions and carbonation. Microstructure analysis has shown that there is an Al-enriched layer at interfacial zone in CSA concrete with the main hydration product of AH3, which is also alkaline and is expected to improve the steel passivity. Furthermore, the interfacial zone has markedly reduced porosity compared to the bulk matrix, which leads to reduced possibility of current flow between anode and cathode and therefore improves the corrosion resistance of the embedded reinforcement.http://dx.doi.org/10.1155/2020/4761854 |
| spellingShingle | Meimei Song Qiu Li Ke Wu Yihua Dou Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure Advances in Materials Science and Engineering |
| title | Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure |
| title_full | Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure |
| title_fullStr | Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure |
| title_full_unstemmed | Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure |
| title_short | Electrochemical Performance of Steel Embedded in CSA Concrete and Its Interfacial Microstructure |
| title_sort | electrochemical performance of steel embedded in csa concrete and its interfacial microstructure |
| url | http://dx.doi.org/10.1155/2020/4761854 |
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