Non-destructive IR-Thermography for Distress Detection in Asphalt Pavements and Bridge Deck Surfacings

This study presents first results and practical experiences with the new EMPA Mobile IR-measurement System (EMIR) which consists of an infrared-thermography camera with data acquisition system mounted on a vehicle. The IR-measurements with EMIR were carried out on different asphalt pavements and bridge deck surfacings for quality assurance as well as maintenance and rehabilitation management purposes. It was found that distress types such as hidden blisters and cavities in asphalt pavement structures can be detected successfully and effectively, provided that the measurements are made under changing temperature conditions in the field. The results demonstrate that EMIR is a valuable tool for early stage distress detection to avoid costly pavement repair and to optimize the planning of rehabilitation measures.