CAP Lab recently completed and submitted the final report for a Joint Highway Research Advisory Council project titled “Determination of the PG Binder Grade to use in a RAP Mix”. This project provided an easier methodology to the Connecticut DOT for determining the correct grade of new asphalt binder to use in pavements that contain recycled asphaltic materials. A summary of this work was presented to the A2D04 committee of the Transportation Research Board (TRB) at the 2001 annual meeting.
CAP Lab continued work with Penn State University in support of a Northeastern States Pooled Fund Project examining pavement issues, including those associated with Superpave. Work was undertaken on a two-year project to examine paving practices using an infra-red thermal camera to identify areas of freshly placed materials that are cooler than the surrounding material. This project will attempt to identify the sources of these cool spots, as it is believed that they shorten pavement lifespan.
CAP Lab also began working on a two-year national pooled fund project to examine the protocols used to determine the Dynamic Modulus of Asphaltic Materials. The Dynamic Modulus of Asphaltic Materials will be required in the 2002 AASHTO Design Guide.
Long Term Performance of Areas Exhibiting Thermal Segregation During Construction
In cooperation with ConnDOT and FHWA, the CAP Lab conducted a three-year study using thermal imaging technology to evaluate hot-mix asphalt pavements at the time of construction for thermal segregation. GPS coordinates were obtained whenever possible at the location where the thermal image was taken. The CAP Lab is starting a project to follow these thermally segregated areas through their service life to document the effects to the longevity of the pavements due to thermal segregation at the time of construction.
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