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    Ilike's Avatar
    Ilike Posts: 34, Reputation: 3
    Junior Member
    		  
    #1

    Jan 31, 2011, 01:00 AM
    Can you reliably pour a new concrete driveway over an old concrete driveway?
    The city came through a neighborhood that I have a rental on and elevated the road about 10 inches and installed new city sidewalks also 10 inches higher and poured a cheap asphalt ramp to the older cracked but functional driveway. In my mind I want to rip out the asphalt ramp, place some forms, and back fill the old driveway with a bit of pea gravel and have a new driveway installed over the old one. Do I really need to rip out the driveway before I proceed? Or will a my idea work? Is there some kind of miracle material that will allow for concrete to adhere to concrete so that it won't shift or get water/ice build up between the driveways in the winter? What do you know?
    smearcase's Avatar
    smearcase Posts: 2,392, Reputation: 316
    Ultra Member
    		  
    #2

    Jan 31, 2011, 07:27 AM

    If you search "bonding new concrete to old concrete" you will find many reliable products. Most of these products have been in use for a long time.
    Pea gravel between new and old is not a good idea..

    If you tie the new concrete to existing (thin edge of triangle) you will likely have to remove some of the existing concrete to reach a minimum depth to avoid breaking it up with vehicle load. In other words, the concrete should be no less than about 5 to 6 inches deep at its thinnest point.
    Will it drain OK?
    artofconcrete's Avatar
    artofconcrete Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 10, 2011, 02:33 PM
    Concrete is expensive to disposal, and doing the driveway twice would be the outcome of capping the driveway. I recommend replacing areas cracked and coating the driveway with coating. The base a-gravel 12" minimum for concrete will determine the overall life of the concrete. 5" minimum for driveway thickness for sure!

    The Art of Concrete
    Www.artofconcrete.ca
    One Masterpeice at a time!
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