how to repair a concrete block wall | doityourself.com
step 1 - clean and prepare the concrete blocks. then use a metal file to smooth off any rough mortar bits around the damage. wear work gloves during this process to protect yourself from some nasty scrapes. once you're finished clean off the concrete with a hose to get rid of any dust left over. while the wall dries bring the rest of your materials up to the repair site.