EVERLIFE LP - PAVED A BRIDGE IN ONTARIO
EverLifeLP™ Paved a Bridge in Ontario
Asphalt mixtures on bridge decks often do not last as intended. Raveling, delamination and potholes are more frequently observed on bridge decks in compared to their adjacent asphalt surfaces. The main cause of such difference in performance could be simply due to inability to achieve proper in-place density by being restricted to static only compaction mode and temperature. Compaction temperature is limited to a certain range to avoid melting any underlaying waterproofing membranes that could cause so called “slippage planes”. Compaction mode and temperature restrictions could further complicate the projects when hauling distance between the job site and production plant is far away.
The McAsphalt’s Technical Services took the challenge to develop a specialty EverLifeLP™mix to better help the industry protect its bridge decks against the ingression of water and brine/de-icing chemicals. The mix was used for the first time in Southern Ontario from a conventional asphalt plant located 120 kilometers away from the job site with the discharge temperature of 150°C and placed at 135°C by using conventional paving equipment.
The mixture after placement was assessed for permeability and long-term fatigue behavior under extreme repetitive stresses that would be expected from heavily loaded traffic coupled with extreme temperatures. The fatigue test results indicated five times more durability for Ever Life LP™compared to a heavy-duty surface mixture designed for highways and bridges in Ontario.