Abstract
The chloride-induced corrosion mechanisms of uncoated, pure enamel (PE)-coated, mixed enamel (ME)-coated, double enamel (DE)-coated, and fusion bonded epoxy (FBE)-coated deformed steel bars embedded in mortar cylinders are investigated in 3.5 wt.% NaCl solution and compared through electrochemical tests and visual inspection. Corrosion initiated after 29 or 61 days of tests in all uncoated and enamel-coated steel bars, and after 244 days of tests in some FBE-coated steel bars. In active stage, DE- and FBE-coated steel bars are subjected to the highest and lowest corrosion rates, respectively. The uncoated and ME-coated steel bars revealed relatively uniform corrosion while the PE-, DE-, and FBE-coated steel bars experienced pitting corrosion around damaged coating areas. Due to the combined effect of ion diffusion and capillary suction, wet-dry cyclic immersion caused more severe corrosion than continuous immersion. Both exposure conditions affected the corrosion rate more significantly than the water-cement ratio in mortar design.
| Original language | American English |
|---|---|
| Pages (from-to) | 58-73 |
| Number of pages | 16 |
| Journal | Cement and Concrete Research |
| Volume | 82 |
| DOIs | |
| State | Published - Apr 1 2016 |
Keywords
- Bars (metal)
- Chlorine compounds
- Enamels
- Mortar
- Pitting
- Chloride induced corrosion
- Chlorides (d)
- Deformed steel bar
- Electrochemical test
- Exposure conditions
- Fusion bonded epoxy
- Long-term performances (c)
- Sem (b)
- Corrosion rate
Disciplines
- Civil Engineering
- Materials Science and Engineering
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