Pavement Performance Measures: How States See Good/Fair/Poor

摘要

This paper reports on performance measures being considered for flexible and rigidsurfaced pavements and the threshold values for these measures. A survey was sent tomembers of the Joint Technical Committee on Pavements and 14 of 20 responded. Theperformance measures for flexible pavements included International Roughness Index(IRI), rutting and cracking. The performance measures for rigid pavements included IRI,patching, cracking, popouts, faulting, and damaged joints. For each measure, states wereasked to define good, fair, and poor both for interstates and other NHS routes. They wereasked to define their system’s performance for given thresholds and for some informationabout how they collect, process, and use the data.States use rutting and cracking to assess performance of flexible pavements. IRI was thethird ranked measure, but it is the measure that is consistently applied to both flexible andrigid pavements. Rutting measurements vary among the states due to the differingmethods used to gather the data. These methods include 3-point sensors, 5-point sensors,line lasers, and 3-D cameras. Use of cracking as a performance measure will requireconsensus building about definitions, measurement methods, and thresholds.The survey responses for rigid pavements were limited to jointed plain concrete because12 of the 14 states indicated that the majority of their rigid pavements are of this type.Additional work will be required for a faulting measure, because the ability to detect thejoint is a function of the distance between consecutive traces. Development of definitions,methods, and thresholds will be required for other rigid pavement performance measuresincluding patching, cracked slabs, and damaged joints.