United States Department of Transportation
i
Use of infrared thermography to detect thermal segregation in asphalt overlay and reflective cracking potential.
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2015-03-01
[PDF-1.09 MB]
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Abstract:The objectives of this study were to assess whether temperature differentials measured using Infrared
Thermography (IRT) occur in an overlay built on top of discontinuities such as joints and cracks and to
study the horizontal and vertical thermal profiles in the asphalt overlay using a validated Finite Element
(FE) modeling approach. To achieve this objective, an infrared camera was used to monitor the
temperature profiles in the asphalt mat in a number of field projects from the time it was placed to after
completion of the compaction process. The temperature profiles were monitored on top and away of
severe discontinuities and joints in the existing pavement. Results showed that thermal measurements on
top of the joints were consistently lower than away from it, which may indicate that temperature loss may
occur at the joints. Further, a validated FE model predicted a slightly higher rate of thermal loss at the
bottom of the overlay above the joint than away from it due to convection losses at the joint. While this
difference may not be large enough to be identified as thermal segregation, it can influence the bulk
properties of the overlay at the joints and promote early cracking. Thermal differences were also observed
in the vertical direction as lower temperatures were predicted at the top and the bottom of the overlay
during construction due to convection losses with the ambient atmosphere and conduction between the hot
overlay and the existing pavement.
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