Abstract
The addition of supplementary cementitious materials may affect the Ca2+ concentration and pH value of the concrete pore solutions. This work studied the influence of the calcium ion on the passivation of the galvanized steel bars in simulated concrete pore solutions with relatively low pH value of 12.5 and 13.15. The results showed that continuous protective layers were formed on the galvanized coating in the solutions with saturated Ca(OH)2 at pH 12.5 and solutions with either KOH or NaOH at pH 13.15. The passive film formed in the saturated Ca(OH)2 solution showed better protective properties than those in other solutions. In the solutions with lower concentrations of Ca2+ at pH 12.5, there was no obvious reaction and no protective layer was formed on the surface. © 2018 Elsevier Ltd
| Original language | English |
|---|---|
| Pages (from-to) | 46-58 |
| Journal | Cement and Concrete Research |
| Volume | 108 |
| Online published | 26 Mar 2018 |
| DOIs | |
| Publication status | Published - Jun 2018 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Funding
The authors gratefully acknowledge the financial support of Hong Kong Branch of National Engineering Research Center for Steel Construction through the project 1-BBYP . Weihua Li also acknowledges the support of National Natural Science Fund for Distinguished Young Scholars ( 51525903 ).
Research Keywords
- Concrete pore solution
- Corrosion
- Galvanized steel
- Passivation
- Protective property