Cracks in concrete floors are often overlooked, as they usually don't affect the service life of the slab. However, it is best to repair these cracks to prevent water ingress that could lead to corrosion of the reinforcing bars, uneven settling or slab movement. There are three common methods for repairing concrete floors and subfloors, which can be used on both interior and exterior surfaces. These methods are intended only for surface restoration and not for repairing major cracks or other structural problems in existing concrete slabs. The first step is to fill the crack with a concrete patch compound as much as possible with a paint removal rod.
Make sure there are no gaps in the patch material and let it harden completely. This layer should occupy large areas towards the bottom of the crack, but not bring the patch material to the concrete floor level yet. The methods used to repair concrete floors harden and bond the surface, trapping lime inside the structure, and thus preventing further crumbling and delamination of the concrete floor. Dry packing is a method that involves manually placing a low-water mortar followed by tamping or tamping the mortar into place, producing intimate contact between the mortar and existing concrete. Cracking is a problem that occurs in most geographic locations and climates, and in many types of concrete structures. In addition, due to the high cost of resin injection, it is not normally used to repair shallow cracks, drying shrinkage cracks, or pattern cracking.
Typical examples of coarse repairs include replacement concrete, pre-placed aggregate concrete, shotcrete, and silica-fumed concrete. You can also repair a concrete floor by cleaning and straightening the damaged area, and then filling it with mortar. Trowel the next layer of concrete patch compound so that the patch is level with the slab surface. The first blow is half the battle, which is also applied when applying a coating or a self-leveling floor to a concrete floor. Concrete floors should be repaired with a surface covering only when the concrete slab contains surface or fine cracks or has aesthetic surface defects. In the past, the only solution for damaged concrete was to completely rip off and replace damaged areas.
However, leaving old concrete in place and applying a concrete grinder with a squeegee reduces costs substantially. Holes 1 inch or deeper require a concrete mix with coarse crushed stone aggregate, which adheres well to existing concrete. The simple fact of pouring wet concrete into a hole in the entrance, sidewalk or basement floor will not be a durable repair.