This project included the use of highly modified hot mix asphalt (HMHMA). HMHMA has a highly modified asphalt binder that helps prevent air voids, provides long-term durability and increases the compaction and workability within a mat. Working with this material required a slight learning curve for the paving crew, and once they figured out its characteristics, it was smooth paving.
This project also included the use of thermal imaging on our paver and rollers. Thermal imaging is focused on the placement and compaction temperatures as well as the roller pattern/path. This helps identify possible locations within the mat that may be troublesome in the future in terms of relative density and material segregation. While paving, there was again a learning curve for the paving crew involving the initial set-up/configuration of the cameras/sensors. After the initial setup of the equipment, before the first paving shift, the crew paved with no differences in their method.