Common repairs for concrete steps include repairing chipped corners and repairing cracks in the steps. Repair chipped concrete by cleaning the damaged area, placing a form against the corner and filling it with a quick-drying cement. After the cement dries overnight, remove the form.
Fix a narrow crack in the step by cleaning the area, then filling the crack with a masonry crack filler inserted through a caulking gun. Another repair is to work vinyl concrete patching compound into the crack.
Undercut a larger crack with a hammer and chisel, then clean out grit and debris. Then, fill the crack with vinyl patching compound or patching mortar.