highway questions
highway questions
(OP)
I looked for a highways forum, figured this'd be close enough.
A couple questions ...
1) why, when resurfacing a highway, do they skip over overpasses ? They've "munched" the road surface on both sides of the overpass, but left the overpass decking. This noticed on the 401 in Toronto.
2) why do they use concrete as the top surface on highway on ground level, but bitumen for overpasses ? This noticed on the 407, north of Toronto.
A couple questions ...
1) why, when resurfacing a highway, do they skip over overpasses ? They've "munched" the road surface on both sides of the overpass, but left the overpass decking. This noticed on the 401 in Toronto.
2) why do they use concrete as the top surface on highway on ground level, but bitumen for overpasses ? This noticed on the 407, north of Toronto.
another day in paradise, or is paradise one day closer ?





RE: highway questions
bridge decks are reinforced concrete. Milling into those can intersect the reinforcing steel...not good. Putting a thin overlay after milling will not last as the stresses at the interface are quite high from traffic loading.
Milling the ground supported pavement is usually a no-brainer....usually not heavily reinforced if at all and not detrimental if impinged. When asphalt is the surfacing, milling and overlaying is a common remediation.
RE: highway questions
http://www.pavementinteractive.org/category/paveme...
RE: highway questions
RE: highway questions
why do you think they'd leave the overpass wearing surface unmilled when they've milled the ground supported wearing surface ?
another day in paradise, or is paradise one day closer ?
RE: highway questions
RE: highway questions
attached photo shows a photo with black topped and un-black topped bridge decks, side by side. you can see that the black top is peeling where it was placed over the concrete deck in a thin layer.
RE: highway questions
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: highway questions
RE: highway questions
Cheers,
Chris
RE: highway questions
RE: highway questions
It's possible that the bridge deck has a waterproofing membrane below the black top. In some environments this is an economical way of preserving the bridge deck.
Here in NY, we sometimes pave bridges when the deck is still in good structural condition but the wearing surface has become "polished" over time.