Asphalt pavement over former concrete building slab

[drewnje]

I have a client that is looking to demolish an old industrial building. They want to leave the building slab in place, fill in some low lying portions of the slab that have settled over time and where some sumps were located with aggregate and then pave the entire area with a 2" asphalt surface course. Currently there is an asphalt parking area around the building. They intend to mill this as necessary to transition from the new pavement surface to the old.
The new surface would be utilized for the storage of their fleet vehicles and trucks.

I am not a pavement guy so I am not sure if this is going to be something that lasts long term or is just a means to save money. I wouldn't care one way or another; however, the area under the pavement and building slab is an old industrial landfill so it is vital to maintain the integrity of the surface to prevent potential infiltration. Given the former nature of the site, any proposed activities will have to be permitted through the appropriate regulatory agencies as they were previously.

Any thoughts or advice on the placement of asphalt over concrete would be greatly appreciated.

Thanks!

 

[oldestguy]

I'd ask you local paving contractor that works now and then for municipalities. This is a common way to get more life out of old concrete pavements. It may take a tack coat on the concrete,depending on what the paver guy thinks will be required. 2" is pretty skimpy, but may work OK.

 

[dik]

We've done this many times, but, with 3" minimum topping. As noted, check with a local asphalt contractor.

Dik

 

[Ron]

First, you'll have reflective cracking around the slab at the interface with the other pavement. Not a big deal but will require maintenance.

I would bust up the concrete slab (technique from a pavement standpoint is called "crack and seat"), roll it with a heavy vibratory compactor then pave it. Don't worry about filling low spots with gravel....you won't have those after you do the crack and seat process.

Agree with dik and OG...2" is sparse....add an inch of asphalt....you won't regret it nor will the owner.