Abstract
Measurements of road roughness using a PCA Road Meter have been made on the 1156 km (718 mile) Interstate System in Oregon annually since 1972. For purpose of comparison and analysis, the measurements are converted to present serviceability index (PSI) values using the ride measurements only. The highway system has been broken down into homogeneous sections based on the pavement structure and construction contract. Structural strip maps were prepared showing the material and thickness of each component of the pavement structure with date of construction and any subsequent overlays. The PSI ratings plotted on this strip map show the pavement performance trend for each section. The superior performance of some pavements has been documented and sections that will be in need of early rehabilitation identified. Analyses of PSI vs. age and PSI vs. heavy truck traffic have been made and compared with PSI values calculated from the Brokaw model equations. The goal of this work is to develop PSI trend curves as an aid to providing advance predictions of when rehabilitation of the pavement sections will be required. This simple and inexpensive method can be very useful in programming future overlay and rehabilitation projects in the management of the pavement system.
Published Version
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