United States Department of Transportation
i
Description & Evaluation of the Alaska Pavement Rating Procedure
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1982-02-01
[PDF-2.10 MB]
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Alternative Title:Description and Evaluation of the Alaska Pavement Rating Procedure
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TRIS Online Accession Number:00367599
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Edition:Final Report
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Abstract:This report describes and examines pavement condition rating methods used on Alaska's roadways since 1978. The methods were intended to provide the specific performance data necessary to optimize construction/maintenance planning and the allocation of available funds. Rating elements include simplified measurements of ride roughness, fatigue (alligator) cracking, patching and rut depth. These features are reported individually but are also combined with traffic data to indicate more general roadway serviceability levels. Field evidence shows that a high degree of variability presently exists in the measurement of cracking, patching and rutting. Coefficients of variations above 20% were estimated for each type of rating element from experimentally repeated measurements. On a given road section, estimates of fatigue cracking made by 15 crews, differed by up to twice the calculated average. Rut depth measurements were typified by calculated standard deviations of about half the mean value. Report findings suggest that great care be exercised on future pavement performance inventories. Standardization techniques are suggested which should improve manual rating methods; although mechanized or electronic data acquisition techniques must be developed to eliminate human error. (FHWA)
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