United States Department of Transportation
i
Critical assessment of I-85 CRCP crack spacing patterns and their implications for long-term performance.
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2014-01-01
[PDF-4.75 MB]
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Abstract:Transverse crack patterns in Continuously Reinforced Concrete Pavement (CRCP) are important
indicators of pavement performance. This study is a) to study the Mean Crack Spacing (MCS) and localized
cracks of a newly constructed CRCP and compare them with a 40-year-old, in-service CRCP, and b) to
establish a location reference framework to support a long-term temporal crack pattern propagation analysis.
Crack patterns were critically assessed in a 52-lane-mile CRCP on I-85 constructed in 2011 southwest of
Atlanta, Georgia, and were compared with the ones in a 6-lane-mile CRCP on I-20 built in 1972 west of
Atlanta. A semi-automatic method was conducted to extract and register the detailed crack maps using 2D
pavement images and high-resolution GPS data. The statistical analysis on all 1,000-ft roadway segments
shows that the average crack spacing on I-85 is smaller than the one on I-20 and the MCSs are generally
bounded by the M-E PDG recommended range (3 to 6 ft.). There is no segment on I-85 with MCS less than
2 ft. The MCSs on I-20 are well bounded by the 1993AASHTO recommended range (3.5 to 8 ft.), but at the
upper end of M-E PDG range. This early stage of crack pattern analysis and the accurate lane-based location
reference has established a solid foundation and framework for potential follow-on studies to correlate crack
patterns with the actual pavement performance, such as punchout, smoothness, and structure/foundation
deficiency.
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