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Evaluation of the Internal Angle of Gyration of Superpave Gyratory Compactors in Alabama.
| 题名： | Evaluation of the Internal Angle of Gyration of Superpave Gyratory Compactors in Alabama. |
| 作者： | BROWN, E. R.; HUNER, M.; PROWELL, B. D. |
| 关键词： | *Compactors-; *Air-voids; *Gyrators-; *Hot-mix-paving-mixtures; *Alabama-; *Angles-Geometry.;Asphalt-concretes; Aggregates-; Compaction-. |
| 摘要： | The application of a compaction effort that will produce similar densities from one Superpave Gyratory Compactor (SGC) to another is crucial to the proper design, production control, and acceptance of HMA mixes. Currently in Alabama, differences in air voids for the average of 3 compacted samples of up to 0.8 percent may be expected between samples compacted in different brands of SGCs. The difference could be as high as 2.3 percent air voids between any two compactors. It is expected that these differences are typical of variations between SGCs across the United States. The angle of gyration is an important factor affecting the compaction effort. This study evaluated the relationship between the internal angle of gyration measured by the Dynamic Angle Validation Kit (DAVK) versus the resulting compacted sample density for a wide range of SGCs. The DAVK device was used to measure the angle of gyration of all of the SGCs used in the state of Alabama; by the contractors, mix designers, and the Alabama Department of Transportation (ALDOT). Each of the compactors should have been set at an angle of gyration, under load, that is within the specification values (1.23 to 1.27 degrees) provided in AASHTO T312. AASHTO T312 measures an angle of gyration that is external to the mold while the DAVK measures an internal angle of gyration. Following the measurements with the DAVK, three replicate samples of a standard mix were compacted to evaluate the sample density produced by the compactor. This procedure was conducted on 112 SGCs throughout the state of Alabama. |
| 报告类型： | 科技报告 |
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