(Video) Remove Concrete Before Paving Driveway With Asphalt - August 14th 2015
Q: Our concrete driveway is badly cracked and chipped. We are thinking of having a new asphalt driveway, instead of concrete. Can we have the asphalt applied directly over the existing driveway or do we have to remove the old concrete?
A: Badly cracked or chipped surfaces on concrete driveways are a sign of poor subsoil compaction and lack of routine maintenance. Asphalt over existing concrete is not the solution, because asphalt requires rolling down by mechanical compaction, which will further damage the concrete, leaving an unstable surface.
Badly cracked concrete should be removed and disposed of. Asphalt driveways should be placed over a prepared compacted road base material consisting of crushed limestone. This is commonly known as road base from aggregate suppliers.
An alternative to concrete or asphalt would be interlocking paving stones, allowing good drainage and adding esthetic value to the home. This would still require the old concrete be removed.
Maintenance of asphalt, concrete or paving stones requires sealing with proper products to minimize future concerns of cracking and spalling.
For asphalt maintenance, apply a jet-coat sealer within two years after installation. Every three years after that, use an acrylic latex sealer.
Here is a video of Shell installing Paving Stones in a driveway...