Evaluation of Materials for Low Temperature Asphalt Pavement Performance, BBR Field study

Asphalt mixtures were collected from seven construction projects, both of the plant and during laydown. One SGC cylindrical specimen or ‘puck’ of 80 mm thickness was prepared for each type of mixture. By doing so, 14 different SGC pucks were obtained. The pucks were labeled as ‘UT-01-P’ to ‘UT-07-P’ for plant mixtures and ‘UT-01-F’ to ‘UT-07-F’ for mixtures that were obtained during laydown in the field. Because of compacting to a specific height, the air voids of the compacted pucks varied from 3% to 6%.

In Lab A, the specimens were tested in the Bending Beam Rheometer (BBR) by following the AASHTO TP 125-16 testing procedure at three different temperatures: -12°C, -18°C, and -24°C. On the other hand, in Lab C, the specimens were tested at only one temperature  (PG + 10°C). In average, 12 specimens were tested for each mixture at both of the laboratories.