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EPOXY COATED REINFORCEMENT STUDY.
| 题名： | EPOXY COATED REINFORCEMENT STUDY. |
| 作者： | Griffith-A; Laylor-HM |
| 关键词： | Adhesion-; Bridge-design; Chlorides-; Coastal-engineering; Corrosion-; Epoxy-coatings; Field-studies; Literature-reviews; Oregon-; Performance-; Reinforcement-Engineering |
| 摘要： | This report evaluates the use of Scotchlite 213 epoxy coated reinforcement in Oregon coastal environments. There is an extensive body of knowledge documenting epoxy coated reinforcement research in North America in the last 20 years. The research has produced mixed results. However, recent studies conducted by Clear and others for the National Cooperative Highway Research Program, by Kessler and others for the Florida Department of Transportation and by Weyers and others in Virginia, provide evidence of poor performance of epoxy coated reinforcement on coastal bridge structures. In 1989, the Oregon Department of Transportation (ODOT) removed a concrete test beam reinforced with Scotchlite 213 epoxy coated reinforcement after nine years of service from Yaquina Bay in Newport, Oregon. Results of the testing and evaluation showed that there was adhesion loss of the coating attributed to low blast profile of the steel and low coating thickness. There was observed corrosion along the longitudinal bars and hoop reinforcement that were located within the tidal zone. Another concrete beam reinforced with Scotchlite 213 epoxy coated reinforcement was removed from Yaquina Bay in 1998 after eighteen years of exposure. The testing and evaluation showed that: (1) Half-cell potential measurements within the beam's tidal zone exceeded the 90% probability threshold (-0.35 V) for corrosion to occur; (2) The chloride concentrations were significantly elevated within the beam's tidal zone; (3) The adhesion loss was greatest within the tidal zone and in some areas, there was total loss of adhesion; and (4) Most of the observed corrosion of the Scotchlite 213 epoxy coated reinforcement was within the tidal zone. Based on the literature documenting previous studies and ODOT's testing and evaluation conducted in 1989 and in 1998, the use of Scotchlite 213 epoxy coated reinforcement for long term protection against corrosion in coastal bridges in not recommended. |
| 总页数： | 1999/06. pp47 (Phots., Figs., 1 Tab., Refs., 1 App.) |
| 报告类型： | 科技报告 |
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