United States Department of Transportation
i
Evaluating the effects of concrete pavement curling and warping on ride quality.
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2015-09-01
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[PDF-3.02 MB]
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Abstract:Construction of a jointed concrete pavement on US 34 near Greeley, Colorado in 2012 led to an investigation of slab curling
and warping that appeared to be contributing to undesirable levels of pavement roughness. Specifically, the westbound lanes
that were constructed in July appeared to exhibit significantly higher roughness than the eastbound lanes that were constructed
in September. Furthermore, smoothness testing by the contractor at three different times of the day on one of the westbound
lanes revealed significant differences in roughness values depending on the time of day. In response, CDOT initiated the
investigation under this study to determine the effects of slab curling and warping on ride quality for the US 34 project with
the expectation that the findings from this study can also be applied to jointed concrete pavement projects in general. The
outcomes of this study are recommendations for improvements in construction practices to help minimize the effects of
curling and warping on jointed concrete pavement ride quality as well as recommendations for the collection of ride quality
data for acceptance.
Implementation
Implementation recommendations include potential modifications to concrete pavement construction practices and/or
specifications, particularly for hot weather paving, as well as recommendations for modifications to the collection of
pavement smoothness acceptance data for jointed concrete pavements. The recommendations for smoothness acceptance data
collection can be implemented on pilot projects or as shadow specifications in the coming construction seasons. After each
construction season, the recommended procedures can be further evaluated before being included in the Standard
Specifications. Recommendations for construction practices/specifications are less substantial and may only require minor
modifications to standard practices and specifications.
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