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The issues and the setting of common engineering criteria to establish threshold values for a better calculation of the pavement distress indices and Remaining Service Life (RSL) are presented. Benefits derived from the use of RSL such as simplifying the Pavement Management System (PMS), computational procedures, improving communication between the various PMS users, and increasing the PMS capability are also included. Within the framework of a PMS, most State Highway Agencies (SHAs) collect pavement condition data to calculate pavement distress indices. Because pavement condition data is the basis for all PMS analysis, the values of the pavement indices are typically prioritized and the highest priority is placed on eliminating most deficiencies. Examination of this effort has indicated that the method is deficient and that the RSL is a better pavement condition index.
Common pavement distress indices deficiencies were found to be related to basing the indices on a single variable (pavement condition at the time of the survey). The rate of the pavement deterioration is not included in the calculation of the indices. In order to eliminate the common deficiencies, it was found that the pavement indices must be based on pavement performance which consists of two variables, surface condition and the rate of deterioration.
Pavement Management System, Distress Index, Remaining Service Life
Michigan State University, E. Lansing, Michigan