How to Fix a Crumbling Concrete Garage

At first glance, crumbling concrete may seem like time to hit the panic button, the reality is that most crumbling areas can be repaired. Concrete will last for centuries when installed properly, as is evident in numerous Roman and Greek ruins throughout Europe. Crumbling areas are either a result of human error or excessive movement, such as with an earthquake. If you are dealing with concrete crumbling in your garage, such as on the floor where the slab is, there is a quick and easy method to get your slab back in working order.

Safety glasses
Dust mask
Work gloves
Broom
Hammer and stone chisel
Circular saw with stone blade
2 buckets
Drill with paddle
Cement
Concrete mix
Paintbrush
Flat metal trowel

Instructions

- 1
  Remove the crumbled pieces of concrete around the area you need to repair. Remove excess around the area with a hammer and chisel to ensure that you have removed any weak pieces close to the area. If the crumbling goes below the surface, use a circular saw with a stone blade to cut out the crumbled area quicker than with the hammer and chisel. Remove the debris and clean the area with a broom.
- 2
  Mix cement and water in a bucket with the drill and paddle, adding enough water to make a soupy, paintable mixture. This is known as a slurry mixture. Cement is a basic ingredient of concrete, and you are patching the area with slurry first so that you have a sticky layer to which the concrete mix can stick. Also mix some concrete mix in another bucket, adding water until you have a thick, peanut butter consistency.
- 3
  Paint the slurry over the area with the paintbrush. Cover the entire area, including the sides and up over the top of the existing concrete. Pour your concrete mix on top of the slurry coat. Smooth it with a flat trowel to match the surrounding concrete. Let the mixture dry for 72 hours before allowing foot traffic or vehicle traffic.

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