Infrared thermography-driven flaw detection and evaluation of hot mix asphalt pavements.
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2010-01-01
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Abstract:This research was conducted to study more realistic explanations of how variables are created and
dealt with during hot mix asphalt (HMA) paving construction. Several paving projects across the
state of Nebraska have been visited where sensory devices were used to test how the selected
variables contribute to temperature differentials including density, moisture content within the
asphalt, material surface temperature, internal temperature, wind speed, haul time, and equipment
type. Areas of high temperature differentials are identified using an infrared camera whose usefulness
was initially confirmed with a penetrating thermometer. A non-nuclear density device was also used
to record how the lower temperature asphalt density compared to the more consistent hot area. After
all variables were recorded, the locations were marked digitally via a handheld global positioning
system (GPS) to aid in locating points of interest for future site revisits in order to verify research
findings. In addition to the location-based database system using Google Earth, an extensive database
query system was built which contains all data collected and analyzed during the period of this study.
Research findings indicate that previously assumed variables thought to contribute to decreased
density due to temperature differentials, like haul time and air temperature, have little impact on
overall pavement quality. Additionally, the relationship between groups of temperature differentials
and premature distresses one year after paving was clearly linked.
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