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Distress Identification Manual
Accurate, consistent and repeatable distress evaluation surveys can be performed by using the Distress Identification Manual for the Long-Term Pavement Performance Program (5th edition). Included color photographs and drawings illustrate the distresses found in the three basic pavement types: asphalt concrete-surfaced; jointed (plain and reinforced) Portland cement concrete; and continuously reinforced concrete. The drawings of the distress types provide a reference to assess their severity. Methods for measuring the size of distresses and for assigning severity levels are included. The manual also describes how to conduct the distress survey, from obtaining traffic control to measuring the cracks in the pavement. Sample forms for recording and reporting the data are included. The manual also discusses fault measurement devices. The LTPP Distress Identification Manual (5th edition) is available for download: Download Manual An updated DIM (6th edition) is in development and incorporates the following directives which modify the last published version of the DIM. This 6th edition of the DIM is currently available through a beta version of the LTPP DIM app on both the Apple App Store and Google Play Store. Directive D-68 has errata on fatigue cracking on flexible pavements and new requirements for measuring transverse profiles. Directive D-67 has errata on spalling of joints on rigid pavements and sealant on transverse cracks. Directive D-65 describes distress types necessary of HPMS and MEPDG reporting. Directive D-64 provides updated blank distress map forms. Directive D-63 documents a change in describing moderate severity edge cracking. Hard copy versions of the LTPP Distress Identification Manual (5th edition) and the pocket guides (based on the 4th edition) are no longer available. The pocket guides may be downloaded using the links below. They do not incorporate the changes from directives D-63, D-64, D-65, D-67 and D-68. Download DIM: Asphalt Concrete Pavements Download DIM: Jointed PC Concrete Pavements Download DIM: Continuously Reinforced Concrete Pavements |
