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A study was performed to evaluate the applicability of using automated profilers to replace the Rolling Straightedges (RSEs) currently used by NJDOT to implement the department smoothness specifications. Two categories of profilers were considered in the study, two lightweight and three full size profilers, in addition to two NJDOT RSEs. Several analyses were performed on the collected data, which include preliminary analysis, RSE simulation, statistical analysis, speed effect analysis and correlation analysis. The RSE simulation analysis consisted of simulating a 10-ft (3.048 m) straightedge over the profile and calculating the deviation at the mid-point of the straightedge. The statistical analyses were performed to investigate the equipment repeatability and the differences among devices, including the two RSEs. Three correlation analysis studies were performed to correlate the RSE measurements with the results of the simulation analysis, to correlate IRI measured with different devices and to correlate the IRI and % defective length.
Pavement smoothness, pavement rideability, smoothness specifications, International Roughness Index (IRI), Rolling Straightedge simulation, percentage defective length and profilers
Principal, Stantec Consulting Inc., Amherst, NY
NJDOT Research Project Manager, Trenton, NJ