Path/driveway – concrete surface deterioration

Cause

Shrinkage cracking

Repair

  • if deterioration is minor, sawcut around the damaged area to 50 mm depth; remove defective concrete; roughen the surface; brush with cement slurry (paste); place new concrete
  • if deterioration is major, remove existing concrete; place a compacted metal (gravel) base course; lay new concrete – a minimum 100 mm thick and reinforced for vehicles; 75 mm thick for pedestrian-only paths (reinforcing not required)

Cause

Poor quality concrete at installation

Repair

  • if deterioration is minor, sawcut around the damaged area to 50 mm depth; remove defective concrete; roughen the surface; brush with cement slurry (paste); place new concrete
  • if deterioration is major, remove existing concrete; place a compacted metal (gravel) base course; lay new concrete – a minimum 100 mm thick and reinforced for vehicles; 75 mm thick for pedestrian-only paths (reinforcing not required)

Cause

Frost damage

Repair

  • if deterioration is minor, sawcut around the damaged area to 50 mm depth; remove defective concrete; roughen the surface; brush with cement slurry (paste); place new concrete
  • if deterioration is major, remove existing concrete; place a compacted metal (gravel) base course; lay new concrete – a minimum 100 mm thick and reinforced for vehicles; 75 mm thick for pedestrian-only paths (reinforcing not required)

Cause

Concrete at the end of its serviceable life

Repair

  • remove existing concrete; place a compacted metal (gravel) base course; lay new concrete – a minimum 100 mm thick and reinforced for vehicles; 75 mm thick for pedestrian-only paths (reinforcing not required)