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Measurement of Water Intrusion Rates into OGFC Layers. Final rept.
| 题名： | Measurement of Water Intrusion Rates into OGFC Layers. Final rept. |
| 作者： | parker, f. |
| 关键词： | *Asphalt-concrete; *Permeability-; *Water-intrusion-rates; *Measurement-.;Superpave-mix-design; Flexible-pavements. |
| 摘要： | A desirable characteristic of dense graded asphalt concrete is low permeability. Low permeability is desirable to minimize water intrusion into the pavement structure which is known to have a detrimental affect on material properties and, therefore, pavement performance. Until implementation of the Superpave mix design system little attention was paid to asphalt concrete permeability. However, with the high compaction levels and coarser gradations initially recommended, larger than desirable water intrusion rates became apparent and some attention was focused on the issue of Superpave designed asphalt concrete permeability. Details of the Superpave mix design system were changed. Compaction energy levels were reduced, increasing asphalt content and compactability, and finer aggregate gradations became more common. Both of these changes should have reduced permeability, but measurements (1) indicated that, Superpave designed asphalt concrete was still somewhat permeable. What is not known is whether Superpave designed mixes are more permeable than comparable Marshall or Hveem designed mixes that have been used for years and, most importantly, how permeable is too permeable, i.e., what is a reasonable maximum permeability for dense graded asphalt concrete. Although evidence is very limited, a maximum value for coefficient of permeability less than 450 x 10(sup -10) cm/sec may be needed to prevent water intrusion into flexible pavements. |
| 报告类型： | 科技报告 |
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