How to Patch Concrete Driveways with Epoxy

What You'll Need
Wire Brush
Caulking Gun

Concrete driveways are very popular for many homeowners. The concrete has a much better finish than that of an asphalt driveway. Many homeowners even elect to have some coloring injected into the concrete for a better fit with the exterior of their home and curb appeal. However, concrete is very prone to cracking. When a concrete driveway cracks, the best way to fix it is with epoxy injections. Epoxy can be used to fill in cracks in the concrete driveway that are not from normal contractions. Epoxy is also DIY friendly.

Step 1: Clear Away Concrete Pieces

Before you can inject any of the epoxy filler you will need to clean away the broken pieces of concrete. Pick up the pieces that you can by hand. Use a vacuum and clear away as much of the smaller pieces as it will pick up. Use a garden hose and wash out any other debris, dirt, concrete pieces, and dust.

Step 2: Chisel Crack

After the crack has been cleaned out you will need to chisel out some of the obstructions of concrete. These are the pieces that are not cracked all the way. This may also entail widening the crack just a little in order to make a smooth area for the expoxy to settle without too many obstructions. Vacuum up any small pieces.

Step 3: Fill Crack With Epoxy Gel

Before you can repair the concrete driveway you will need to inject some epoxy gel onto the surface cracks so that the genuine epoxy will not run out before it dries. Since epoxy can take several hours to dry it will need to have some sort of barrier to keep it contained. Spread out the gel along the cracks.

Step 4: Drill Injection and Vent Holes

Once the gel has had a chance to set up you will need to drill in some injection holes for the epoxy resin. There will also need to be some vent holes for the excess to be able to flow out of. These vents are also for air to circulate and harden the epoxy at a faster rate.

Step 5: Inject Concrete Epoxy

Once the holes are drilled you should clear away the dust and debris one more time. If it is allowed to mix with the epoxy resin it will form a paste that will block the resin from flowing. Make sure the area is dust free. Inject the concrete epoxy into the injection hole. Make sure that you do not go over 40 psi as this will cause the epoxy to widen the crack even more. Adjust the pressure of the injection device to lower than 40 psi.

Step 6: Let Dry and Grind Even With Driveway

After the epoxy has set up, it should be left for at least 24 to 36 hours; then you can begin to grind it down until level with the concrete driveway. A sander with regular sandpaper is not enough for this project. A wire brush will help to get most of the excess away from the driveway, while a grinder with course paper will finish it off.