Concrete ramp over asphalt

Old 06-12-06, 10:35 AM
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Join Date: Apr 2005
Location: Houston, TX
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Concrete ramp over asphalt

At my church, I've been given the opportunity to install a wheelchair ramp connecting a concrete sidewalk to the asphalt parking lot.
I would like to make the ramp about 6 feet wide. The sidewalk is approx 5 inches above the asphalt and by code the ramp will need to extend at least 5 feet out over the parking lot.
I've done very little concrete work and certainly nothing like this.
Several issues to deal with:
a) proper attachment to the wall of the sidewalk (expansion joint needed?)
b) recommended internal reinforcement of the ramp
c) best way to assure good adhesion to the asphalt
d) surface prep for both the sidewalk wall & the asphalt
There are probably many more details, and hopefully someone can advise me.
Old 06-12-06, 11:18 AM
Join Date: Mar 2005
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Concrete ramp over asphalt

The best method would be to cut out the asphalt so you have a minimum 4" thick slab for the ramp. A 6" thick slab may be just as easy and more desireable since cars wil eventually drive over the corners. Tapering down the concrete thickness and bearing on the existing asphalt would not be long-lasting. Fill any small gaps between the new concrete and old asphalt with asphalt patch available from a big box store.

Drill some 3/8" holes 3" deep and about a foot apart into center edge of the existing concrete slab. Insert bolts or rebar (6"+ long) when you pour the concrete so the new concrete cannot settle below the existing slab and create a dangerous lip.

You will not have to adhere it to the asphalt since it is set in the asphalt.

Use some wire mesh 6x6 spacing in the concrete slab. Fiber mesh is not feasible if you are mixing the small amount yourself.

Old 06-12-06, 12:49 PM
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Or just construct the ramp from asphalt.

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