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An electrochemical and microstructural characterization of steel-mortar admixed with corrosion inhibitors |
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| Authors: | XianMing Shi ZhengXian Yang Tuan Anh Nguyen ZhiYong Suo Recep Avci ShiZhe Song |
| Affiliation: | (1) School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;(2) Corrosion and Sustainable Infrastructure Laboratory, Western Transportation Institute, College of Engineering, Montana State University, PO Box 174250, Bozeman, MT 59717-4250, USA;(3) Civil Engineering Department, Montana State University, 205 Cobleigh Hall, Bozeman, MT 59717-2220, USA;(4) Imaging and Chemical Analysis Laboratory, Department of Physics, Montana State University, Bozeman, MT 59717, USA |
| Abstract: | The present research brings new insights on the role of admixed corrosion inhibitors in the processes of cement hydration and rebar corrosion. The admixing of NaCl and the corrosion inhibitors in fresh mortar was found to alter the morphology and microstructure of the hardened mortar at the steel-mortar interfacial region. The admixing of the inhibitors increased the risk of carbonation of cement hydrates at the steel-mortar interfacial region, but partially displaced chloride ions. Chloride and the admixed inhibitors facilitated the formation of different cement hydrates and affected chloride binding at the steel-mortar interfacial region. The admixing of all three inhibitors was found to increase the polarization resistance of steel, indicating reduced corrosion rate of the steel over 48-day exposures to salt ponding. |
| Keywords: | corrosion inhibitor rebar corrosion steel-mortar interface FESEM EDX XPS EIS |
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