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DEVELOPING CRITICAL FIELD PERMEABILITY AND PAVEMENT DENSITY VALUES FOR COARSE-GRADED SUPERPAVE PAVEMENTS.
| 题名： | DEVELOPING CRITICAL FIELD PERMEABILITY AND PAVEMENT DENSITY VALUES FOR COARSE-GRADED SUPERPAVE PAVEMENTS. |
| 作者： | Cooley-LA Jr.; Brown-ER; Maghsoodloo-S |
| 关键词： | Aggregate-gradation; Air-voids; Asphalt-mixtures; Coarse-aggregates; Durability-; Hot-mix-asphalt; Permeability-; Superpave- |
| 摘要： | Within the hot-mix asphalt (HMA) community, it is generally accepted that the proper compaction of HMA is vital for a stable and durable pavement. Low in-place air voids have been shown to lead to rutting and shoving, whereas high in-place air voids have been shown to reduce a pavement's durability through moisture damage and excessive oxidation of the asphalt binder. Recent research has suggested that coarse-graded Superpave-designed mixes are more permeable than conventionally designed pavements at a given air void content. This higher permeability can lead to durability problems. The pavement density at which coarse-graded Superpave mixes become permeable was evaluated by using a field permeability device. On the basis of the data collected, 9.5- and 12.5-mm nominal maximum aggregate size (NMAS) mixtures become excessively permeable at approximately 7.7% in-place air voids, which corresponded to a field permeability value of 100 x 10 to the -5 power cm/s. Mixtures having a 19.0-mm NMAS became permeable at 5.5% in-place air voids, which provided a field permeability value of 120 x 10 to the -5 power cm/s. Coarse-graded mixes having an NMAS of 25.0 mm became permeable at 4.4% air voids, which corresponded to a field permeability value of 150 x 10 to the -5 cm/s. |
| 总页数： | Transportation Research Record. 2001. (1761) pp41-49 (12 Fig., 1 Tab., 9 Ref.) |
| 报告类型： | 科技报告 |
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