United States Department of Transportation
i
Development of Procedures for the Calibration of Profilographs
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1989-08-01
[PDF-5.61 MB]
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Edition:Final Report
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Abstract:A review of current information concerning the methods and equipment for measuring the roughness of new pavements revealed that most States use rideability criteria to determine the quality of newly laid pavement, with the California profilograph as the dominant type of equipment employed. Bump specifications, which have been used throughout the highway construction industry for many years, are useful in controlling individual vertical deviations of pavement profile, but provide no information on the overall roughness over a longer distance. A full-scale testing program investigated the basic roughness characteristics of new pavements, represented by power spectral density functions which were then used to generate average-profile data. Road roughness measuring devices, including the California, Rainhart, and Ames profilographs, profilometer, and Mays meter, were evaluated on the basis of frequency response, precision, repeatability, reliability, and ease of operation. Researchers sought to determine whether correlations can be established between the profilographs and other roughness measuring devices. Computer simulation of a profilograph, in which the effect of varied design parameters on profilograph performance was investigated, yielded the formulation of an optimal profilograph design as a general optimization problem.
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