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Methods of Corrosion Protection and Durability of Concrete Bridge Decks Reinforced with Epoxy-Coated Bars. Phase 1; Final rept
| 题名： | Methods of Corrosion Protection and Durability of Concrete Bridge Decks Reinforced with Epoxy-Coated Bars. Phase 1; Final rept |
| 作者： | Samples, L. M.; Ramirez, J. A. |
| 关键词： | Corrosion prevention; Reinforcing steels; Bridge decks; Epoxy coatings; Concrete durability; Spalling; Cracking(Fracturing); Concrete; Field tests |
| 摘要： | In this study, the results of an extensive field and laboratory investigation conducted to evaluate the corrosion performance of epoxy-coated reinforcement are reported. The results from the holiday testing showed that an average of 31 holidays per meter (9 holidays per foot) were created during the concrete casting operation. Increasing the coating thickness by 101.6 micrograms (4 mils) and lowering the hose used when pumping concrete to the level of the top mat of reinforement reduced the holidays created to to 11.5 holidays per meter (3.5 holidays per foot) after casting. The results of 16 specimens subjected to cycles of exposure in the laboratory evaluation indicated that if the mat to mat resistance was greater than 5000 ohms, then over the 77-week period no corrosion activity was observed. No corrosion activity occurred even though the chloride levels at the reinforcement location were well above 0.79 kg/cu m(1.3 lb/yd(cubed)), the threshold level for initiation of corrosion. A possible way to achieve a high mat to mat resistance would be by limiting the damage to the epoxy coatings. |
| 总页数： | 278p |
| 报告类型： | 科技报告 |
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