Pouring Concrete Over Existing Concrete Driveway

If you decide to use a portland cement latex modified or epoxy modified concrete overlay carefully follow the.
Pouring concrete over existing concrete driveway. The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk. Yes you may pour a concrete pad overlay over an existing slab. The new concrete certainly isn t going to float up in the air or slide off. Over the course of my 20 year contracting career i ve poured countless 2 inch caps over existing concrete with no problems.
Pour concrete onto the existing slab until it is around where you want the final level to be. Here s the catch if the existing surface is somewhat in a structurally sound shape and elevating its height to a few inches won t be a problem you can certainly freshen it up with a new layer of concrete. If the concrete has multiple deep cracks extending all the way through its depth pouring concrete over existing sidewalk driveway or patio surfaces generally is a waste of time. However proper prep work is needed.
Concrete is poured with expansion joints that allow room for the pavement to expand in hot weather. Steps involved in pouring concrete over existing concrete slab step 1. Sweeping dirt s debris over the existing concrete slab will allow bonding to take place. This includes removing sand dead leaves and gravel.
Cleaning old concrete surface. The condition of the existing slab is the primary factor that determines how long the new concrete will last. Pouring concrete over the existing one. You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly.
By the same token if you attempt to clean the surface and the concrete just keeps breaking apart into bits of sand and gravel replacement is your best option. Pouring concrete over an existing concrete driveway or sidewalk. Overlays may include polymers portland cement concrete or epoxies. You need to consider the added height and weight of the overlay on the existing structure.
Asphalt driveways that are paved over an appropriately compacted subbase will always be superior to asphalt that is laid over an unstable base or concrete that is prone to shifting and expansion. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. One of the best tools that can be clean all the debris out of crack is a stiff bristle broom.
Apply the new concrete over the primer. Make sure you have enough concrete to fill the entire area to the depth you desire.