United States Department of Transportation
i
Investigation of early distress in Wisconsin rubblized pavements.
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2011-07-01
[PDF-1.41 MB]
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Edition:Final report; 2011.
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Abstract:This study investigated premature distress formation in Wisconsin HMA overlays of rubblized concrete pavement. The premature
distress was tented transverse cracking, which formed during the winter season and significantly affected pavement ride. The intent
of this study was to determine the mechanism behind the failure and recommend changes in design and construction of rubblized
pavements to prevent future failures. Design parameters, soil properties, historic distress levels, and several additional factors were
analyzed for 19 good‐ and poor‐performing pavements. Service life and construction practices were also evaluated.
Tented transverse cracking was a result of non‐uniform support of the rubblized layer. Weak support occurred at previous locations
of deteriorated joints and cracks in the concrete pavement, causing a reflective crack in the HMA layer. Water entered the crack,
froze and expanded in the winter, and caused tenting of the crack. It is recommended that deteriorated joints be repaired with base
patching to create a more uniform pavement foundation. Test rolling of the rubblized layer was also suggested to locate additional
weak areas. It is recommended that these weak areas be excavated below subgrade and backfilled with aggregate material.
Using predictive models based on pavement distress information, the service life of the 11 pavements in the good performance
category was forecast to be 17 to 25 years. The eight pavements in the poor performance category were projected to have a service
life of 13 to 15 years.
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