Quote:
Originally Posted by vjose32
Maybe they were cheap as they used concrete on the McPhillips underpass and not asphalt
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McPhillips had issues with utilities and such being very shallow. That's why it took forever.
New asphalt roads will never have concrete below them. Placing asphalt on top of concrete is a retrofit situation. I'm not sure of the popularity of this method in other places, but is extremely common and the de facto rehab in Winnipeg. Everything will get a TBO before it is blown up and fully re-constructed. This pushes off the expensive projects for 10-20 years.
There is no reason to be placing a new concrete roadway, then put asphalt on top unless you are doing this for ease of maintenance. Such things are done on the interstates and large volume highways around the world. You can come in and do a mill and fill overnight. Minimizing disruption to busy day time traffic.
Waverley underpass is asphalt for no other reason than cost. Probably was cheaper to do it asphalt. Doesn't mean that's it worse than concrete.