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Development of Guidelines for Reduction of Temperature Differential Damage (TDD) for Hot Mix Asphalt Pavement Projects in Connecticut.
| 题名： | Development of Guidelines for Reduction of Temperature Differential Damage (TDD) for Hot Mix Asphalt Pavement Projects in Connecticut. |
| 作者： | HENAULT, J. W.; SCULLY, J. J. |
| 关键词： | *Asphalt-pavements; *Damage-assessment; *Infrared-detection.;Thermography-; Pavement-damage; Hot-mix-paving-mixtures; Separation-. |
| 摘要： | This paper presents alternative thinking on the subject of thermal segregation of hot mix asphalt (HMA) during pavement construction. Contemporary wisdom may overstate the significance of thermal segregation to pavement performance. The authors present the concept that density achieved is more dependent upon HMA temperature (T) than temperature differentials (.T). It is surmised that thermal segregation has a negligible effect until cold area temperatures drop below certain threshold values. This reasoning is based upon results of a five-year pavement condition survey that demonstrated little if any relationship between temperature differentials located with an infrared camera during HMA construction, and subsequent damage to a pavements surface. Additionally, the idea that infrared camera images provide a method for detecting and measuring particle segregation is challenged. Instead, thermal and particle segregation are likely to be independent conditions. Comparisons of asphalt contents and grain-size distributions between cold areas and their surrounding normal-temperature pavements demonstrated no significant differences, suggesting temperature differentials in the HMA during construction are not necessarily indicative of particle segregation. Finally, definitions for the terminology associated with HMA construction and infrared thermography are presented. |
| 报告类型： | 科技报告 |
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