Effect of Sample Unit Size and Number of Survey Distress Types on the Pavement Condition Index (PCI) for Asphalt-Surfaced Roads.
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
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This study presents the results of quantifying the effects of altering the sample unit size on the Pavement Condition index PCI for asphalt-surfaced roads. This study also investigates the effect of consolidating distresses into fewer distress types during condition surveys. The effect of altering sample unit size was investigated using surface photographs of 24 asphalt surfaced pavement sections located in Urbana-Champaign, IL. Continuous 35-mm strip photographs of each pavement surface were obtained using the PASCO system. The continuous photographs were subdivided into image units, each 10 ft long and one lane wide. Sample units 200 ft long by one lane wide, were developed by grouping 20 contiguous images. The PCI of each sample unit was calculated based on observable distresses. Pavement image groups were developed by combining varying numbers of contiguous pavement images. The PCI was then calculated for each group using standard deduct curves and PCI calculation methodology. The effect of reducing the number of recorded distresses was investigated using distress data contained in Micro PAVER databases from several military installations and cities. Comparisons were made between PCI values calculated using standard PCI procedures 19 distress types and PCI values calculated using modified distress identification procedures developed by the Metropolitan Transportation Commission seven distress types.
- Civil Engineering