United States Department of Transportation
i
A synthesis study of noncontact nondestructive evaluation of top-down cracking in asphalt pavements.
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2013-12-01
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Abstract:The primary objective of this research study was to conduct an extensive literature review on top-down
cracking evaluation studies, prepare a synthesis of findings, and recommend a follow up phase for a
pilot study in Mississippi with a candidate technology. The top-down cracking appearing mostly in
longitudinal wheel paths on asphalt highway pavements, was first reported in the 1970s in tropical
countries, later reported in the 1980s in the UK, the Netherlands, France and South Africa, followed by
field investigations in the late 1990s and 2000s in the United States, several European countries, and
Japan. Since then the top-down cracking distress has been identified as the most important distress
observed on asphalt highways in many states including Florida, Indiana, Michigan, Washington,
Illinois, and Mississippi. Proper and timely maintenance of top-down cracking is critically important for
thick asphalt pavements. Therefore, a procedure is needed to expedite field survey of top-down cracking
without depending on cores. An existing viable nondestructive and noncontact technology operating at
highway speed was not found in this study. Therefore, a problem statement for research need is
prepared for a national study through NCHRP.
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