Segregation is a common occurrence in hot mix asphalt (HMA) construction. The two types of segregation encountered are gradation segregation and thermal segregation. This investigation report involves mainly thermal segregation, which occurs when areas of the HMA mat are significantly colder than other areas. Various investigations have determined that cold areas within the asphalt mat during construction tend to show a corresponding decrease in finished pavement density, which could have a detrimental effect on pavement life. This investigation report outlines the effort to gain insight on the long term effects of thermal segregation on the life of a pavement surface. Instances of thermal segregation were identified during HMA construction using an infrared camera and the locations of these instances were noted using GPS coordinates. Then these locations were monitored every six months to develop a timeline for any temperature differential damage that occurred. The data and conclusions reached are outlined in this report.
Connecticut Department of Transportation personnel used an infrared camera to observe thermal segregation of hot mix asphalt during pavement construct...
A longitudinal joint is the interface between two adjacent and parallel hot-mix asphalt (HMA) mats. Inadequate joint construction can lead to a locati...
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United States Department of Transportation
[PDF-2.36 MB]
