原文传递
The effect of voids on the corrosion of post tensioning tendons: second destructive examination
| 题名： | The effect of voids on the corrosion of post tensioning tendons: second destructive examination |
| 责任者： | M McKenzie |
| 关键词： | not available |
| 学科分类： | 公路工程 |
| 摘要： | Post-tensioning is a common form of construction for medium to long-span concrete bridges. After tensioning, the ducts are usually filled with a cementitious grout to provide a structural bond between the stressed tendons and the concrete, and to protect the tendons against corrosion. However there is a possibility that some parts of the duct will remain ungrouted and the subsequent ingress of water or chlorides from de-icing salts could initiate corrosion. An investigation was carried out to provide information on corrosion rates for post tensioning tendons in post tensioning ducts with a range of void types. The main part of the experiment comprised a support beam with a stressed tendon running along each side. Along each tendon were sections of grouted duct with different types of void and exposed to different levels of chloride. The development of corrosion was monitored visually, by electrochemical testing, and destructive examination. There were also some smaller individual sections of ducting where the tendons were not stressed. The voids in these were the same as in the main part of the experiment. Destructive examinations were carried out after two and three years exposure on both the stressed and unstressed samples and the condition of the tendons in the different void types was assessed. |
| 出版机构： | Transport Research Laboratory |
| 提交日期： | 1 December 2007 |
| 总页数： | 25 |
| 报告类型： | 科技报告 |
| 资源类型： | 科技（咨询、行业）报告 |
| 初始创建时间： | 1 December 2007 |
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