When it comes to repairing concrete, you need to have a sound understanding of exactly how to patch it as this will not only save you time, but it will also save you a great deal of effort and money.
Repairing Hairline Cracks
Water should be mixed with basic Portland cement when repairing hairline cracks. Wet the old concrete along the hairline crack with water for some hours before you add grout. Moisten the original concrete, however, don’t use too much water so that it won’t accumulate on the surface.
Apply the mixture with a trowel. Fill the cracks, then scrape the surface so as to make it smooth. The patch should be covered with plastic and then left to dry for several hours. The patch should be moisten once day for five days and it should be left covered at all other times. The patch should be done curing after five days, therefore ,it can be left uncovered and dry.
Repairing Sidewalk Cracks
If a crack is larger than a simple hairline, you have to enlarge it with a hammer and chisel before you can actually repair it. As you are chipping the crack, make sure it is done in a way that widens the bottom more than the top so as to create a better bond between the patch and the original slab.
The crack should be chipped until it is about 1 inch deep and free of all dirt or debris. Also, spray with a hose to ensure all the dirt and loose particles have been removed. Scrub it, afterwards.
The next thing to do is to apply a concrete adhesive to the surface using a paint brush. Let it dry slightly so that it has a sticky texture. When you’ve gotten a good, sticky surface for the concrete, add water to premixed concrete and then patch the crack. If it is a small patching jobs, pre-mixed concrete patch can be used. If you use ready-mix concrete patch, the only thing you need to do is add water.
Fill the crack completely and then, tamp the patch. Scape the surface with a trowel as the concrete settles. To create a smooth surface, use a metal trowel, but if a rough surface is what you want, switch the trowel for a wood float.
Let it dry for several hours, then cover the patch with plastic. Wet the area once a day for five days while keeping the surface covered at all other times.
Repairing Concrete Driveways
The process involved in repairing driveway cracks is almost the same as that of sidewalk cracks, but a driveway repair must have the ability to withstand more weight than a sidewalk. This means that gravel should be used in place of sand for the mixture.
You must first chisel, clean, and apply adhesive to the hollowed crack. If you want to make the strongest repair possible, you have to chisel deeper than that of a sidewalk repair. Repeat the same steps for applying the concrete as it was done for a sidewalk. You mustn’t drive over the new repairs as the concrete settles over the course of about five days so as not to risk damaging the repair.