“Blow-up” can be prevented by providing contraction joints at regular spaced intervals. Generally speaking, for a 4” slab thickness, these joints should be spaced at 10’ intervals. The joints should be sealed with an effective flexible sealant which will reject the intrusion of sand, etc. To repair concrete that has “blown-up”, the damaged section must be removed and replaced with new concrete. Install functioning, sealed, expansion joints at the repaired area.