Hello. My basement foundation cement blocks are crumbling (I believe my home inspector labelled it "spalling") in a few spots at the bottom, near the floor. It appears as if the sand or dirt is coming in from the ground - or maybe it is just the cinder block material that has deteriorated to a sandlike consistency.?? My question is how do I patch this up. Cement mix? Mortar mix? Other? I'd say the "holes" are 3-4 inches in depth and height. Thanks so much for anyone's help they may be able to give me.