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Evaluation of Asphaltic Expansion Joints. Final rept.
| 题名： | Evaluation of Asphaltic Expansion Joints. Final rept. |
| 作者： | AUSTERMAN, A. J.; MOGAWER, W. S. |
| 关键词： | *Bridges-; *Expansion-joints; *Performance-evaluation.;Failures-; Costs-; Design-; Life-span; Bridge-inspection; Laboratory-tests; Binders-; Resilience-; Aggregates-; Literature-review. |
| 摘要： | Asphaltic expansion joints, commonly referred to as Asphaltic Plug Joints (APJs), provide a relatively low cost joint option for bridges with approximately one-inch of movement. However, failure of these joints can expose the underlying structural bridge components to water and salts that can lead to corrosion. In New England, many of these joints have reached or nearing the end of their anticipated service life. The objectives of the research presented herein is to identify reasons of joint failure, identify the useful life span, evaluate the overall costs, identify flaws in installation and maintenance methods, and establish recommendations regarding initial design considerations (skew, expansion, etc.). Field inspections were conducted on 64 in-service APJs in five New England states to determine predominate materials distresses leading to failure. These distresses were determined to be debonding, cracking and rutting. Lab testing was conducted on virgin binder and aggregate as well as cores of in-service APJ material. Each binder was tested to determine its Superpave Performance Grade (PG) and evaluate its resiliency. The aggregates were tested to determine their gradation and amount of fines. The core material was extracted to determine gradation and approximate binder content. This testing information, along with a comprehensive review of existing specifications, was used to develop design guidelines, a design specification, an installation specification, and a repair specification for use in New England. |
| 报告类型： | 科技报告 |
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