Development of a Screed to Detect and Measure Segregation of HMA Pavements

摘要

Previous research indicated that temperature differentials can be used to establish if a hot mix asphalt (HMA) pavement is likely to have uniform material properties that can be related to pavement performance. The goal of this research project was to develop a prototype infrared sensor bar that can be mounted to the back of the paver that includes data acquisition and analysis software. The prototype unit consists of a transverse line of infrared sensors, signal conditioners, and computer data acquisition system, and a global positioning system (GPS). The system can continuously monitor temperature differentials during construction. Real time transverse temperatures are plotted on a computer screen for use by the paving crew. The software produces a summary of potentially segregated areas by level of segregation (i.e., low, medium, and high) as well as the number of paver stops over one minute for use by the state agency.