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Accession Number PB2013-101756
Title Field Evaluation of Temperature Differential in HMA Mixtures.
Publication Date May 2012
Media Count 78p
Personal Author C. B. Gunter
Abstract 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.
Keywords Density
Hot mix asphalt
Hot Mix Asphalt (HMA)
Infrared camera
Temperature differential damage
Thermal segregation

Source Agency Federal Highway Administration
NTIS Subject Category 89G - Construction Materials, Components, & Equipment
50C - Construction Equipment, Materials, & Supplies
Corporate Author South Carolina Dept. of Transportation, Columbia. Research and Materials Div.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1304
Contract Number N/A

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