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Repeatability analysis of the K. J. Law Model 8300 Roughness Surveyor : final report.
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1991-04-01
[PDF-702.44 KB]
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Alternative Title:Repeatability analysis of the K. J. Law Model 8300 Roughness Surveyor.
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Abstract:The K.J. Law Model 8300 Roughness surveyor, is a ride-quality measurement device used to determine and analyze the longitudinal roadway profile. This paper describes an analysis of IRI data as collected with Louisiana's Roughness Surveyor to determine the statistical reliability and repeatability of the device.
The results of the repeatability analysis indicate the K. J. Law Model 8300 Roughness Surveyor characterizes roadway roughness in a repeatable manner during same day or day-to-day testing for dense-graded asphaltic concrete and jointed Portland cement concrete pavement surfaces. On an open-graded asphaltic concrete surface the Roughness Surveyor was found to be repeatable in some instances and not repeatable in other instances.
It was determined that the mean value of the International Roughness (IRI) from only two repeat runs are necessary to adequately characterized pavement roughness on the dence-graded asphalt and Portland cement concrete surfaces. Due to the variability in repeatability on the open-graded asphaltic concrete surface, the minimum number of runs could not be determined.
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