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Enhanced Performance Zinc Coating for Steel in Concrete
| 题名： | Enhanced Performance Zinc Coating for Steel in Concrete |
| 作者： | Berke, N. S. |
| 关键词： | Zinc coating##Steel##Concrete##Thermal zinc diffusion coatings##Galvanized coatings##Bridges##Deicing##Marine salts##Corrosion resistance##Reinforcing bars## |
| 摘要： | Emphasis on the long-term performance of bridges and other department of transportation (DOT) structures exposed to deicing or marine salts requires improving the corrosion resistance of embedded steel as well as the performance of the concrete. Stainless steel reinforcing bars are currently being specified in these structures, but with reduced permeability in the concrete, more cost-effective alternatives are attractive. Concerns with these alternatives are typically about corrosion at cracks in concrete as well as damage to the coating if coated steel is utilized. This report evaluates thermal zinc diffusion (TZD) coatings on reinforcing bars, which provide the alloy bond found in hot-dipped galvanized (HDG) coatings with several advantages: a) tighter thickness tolerances, b) better ductility, c) applicability to high tensile strength steels, and d) less likelihood of embrittling the steel substrate. These coatings (ASTM A1059) have corrosion performance surpassing that of HDG, but uses so far have been for fasteners and other hardware in atmospheric and marine exposures. |
| 总页数： | 55 |
| 报告类型： | 科技报告 |
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