A new technology involving asphalt cement modified with HyperTherm was used to demonstrate that warm mix asphalt technology can be used to extend the paving season by facilitating paving in cold weather. HyperTherm was initially validated as an effective warm mix technology during an overlay project on Katimavik Road in the City of Ottawa. The job involved the City of Ottawa new 4.75 mm FC1 mix intended for traffic level C (3 to 10 million ESAL's) placed at nominal 25mm thickness. The warm-mix was produced at about 120 degrees C at the plant and compacted at between 75 degrees C - 90 degrees C. Phase two of the study utilized the improved mix workability properties imparted by warm mix technology to extend the paving season in a cold weather application. Oxford Road 4 in the County of Oxford, Ontario was paved with PG 58-28 modified with HyperTherm during the month of December. By producing the mix at conventional hot mix temperatures, compaction targets were achieved despite the low ambient air temperature and frozen granular grade. The improved workability imparted by the warm mix additive counteracted the cold weather conditions. For teh covering abstract of this conference see ITRD number E216597.
Samenvatting