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Thermal Segregation.
| 题名： | Thermal Segregation. |
| 作者： | GILBERT, K. |
| 关键词： | *Hot-mix-paving-mixtures; *Asphalt-pavements.;Compaction-; Density-; Aggregrates-; Thermography-; Temperature-effects; Infrared-detectors; Segregation-; Pavement-damage; Binders-; Construction-materials. |
| 摘要： | The purpose of this study was to detect thermal segregation and its resulting effect on pavement density. Thermal segregation can be caused by material cooling and not being thoroughly remixed or by segregation of the hot mix asphalt (HMA). If the HMA segregates, it is expected that the coarse aggregate will cool more quickly than will the fine aggregate. This study identified areas of thermal segregation, either by cooling or by material segregation. A thermal camera was used to quickly identify areas with a 25 degrees F or greater temperature difference. An infrared temperature gun was also used in an attempt to locate temperature segregation with a less costly device. Segregated areas were located for nuclear density testing following rolling of the HMA. The area that was 25 degrees F or more cooler than the surrounding mat was tested for relative compaction. An adjacent area that was a minimum of 25 degrees F warmer was also tested for relative compaction. |
| 报告类型： | 科技报告 |
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