Ion Distribution at Steel/Concrete Interface in Steel Reinforced CSA Concrete by Newly Updated Image Analysis Technique

5th Annual International Workshop on Materials Science and Engineering

Song, Meimei^1 ; Wang, Chuanlin^2

Department of Mechanical Engineering, Xi'An Shiyou University, Xi'an

710065, China^1

College of Engineering, Shantou University, Shantou

515063, China^2

关键词: Cementitious materials;    Image analysis techniques;    Ion distributions;    Ion exchange properties;    Long term durability;    Low carbon cements;    Quantitative imaging analysis;    Standard procedures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/585/1/012079/pdf
DOI  :  10.1088/1757-899X/585/1/012079

来源: IOP

【 摘 要 】

Calcium sulfoaluminate (CSA) cement is potential low-carbon cement; therefore investigation on ion exchange property at the steel/concrete interface is of great importance to understand the corrosion resistance and long-term durability properties of steel reinforced CSA concrete. Moreover, there is still a lack of standard procedure for quantitative imaging analysis in the study of cementitious materials so far. In this study, we developed an updated imaging analysis technique to investigate the atomic information in steel reinforced CSA concrete by using quantified elemental mappings. Microstructure of steel reinforced CSA concretes were characterized by SEM/EDX. The results indicated that there was less active ion distribution at the steel/concrete interface in CSA concrete than that for OPC concrete. Al/Ca ratio decreased over the interfacial zone gradually with ageing period of up to 1.5 years, but Al still dominated in the CSA concrete compared to the OPC concrete.