Repairing a crack in concrete:
These are steps in fixing cracked concrete.
Open the crack a minimum of 1/4″ inch wide by 1/4″ inch deep with a crack chaser diamond blade and angle grinder or skill saw. Make sure to remove loose or spalled concrete pieces and vacuum clean.
Fill the crack with silica sand to prevent the filler from disappearing beneath the crack as well for additional strength.
Mix the epoxy or polyurethane filler material
inject or pour the filler material into the crack and let it settle, top up any sagging areas or add more sand if necessary.
Sand, scrape or grind off excess material to leave a smooth finish.