Path/driveway – concrete surface deterioration

Cause

Poor quality (low strength) concrete at installation or poor finishing

Repair

  • consider first whether replacement of the path/driveway with good quality concrete may be a better long-term option than repair

  • if repairs are preferred, first fill any cracks. Brush or waterblast away soil, debris, weeds and loose concrete from the crack. If the crack opening is narrow but the crack is wider below the opening, chisel the edges to make the opening more accessible for repair compound. Remove all loose material. Trowel filler compound into the crack, following the manufacturer’s instructions. Proprietary filler compounds are readily available at hardware stores. Feather the edges to make them less visible then lightly broom for a slip-resistant finish. Leave to cure for the recommended time

  • to refresh the surface appearance of concrete, apply a proprietary modified cement coating. These typically come dry in 20kg bags and are mixed with water when used. The surface of the concrete must be clean of dirt and particles, oil and any sealers. Acid washing/grinding may be necessary (and is best done by an experienced contractor). Cracks and holes should be filled as in the first bullet point. A good bond requires a rough surface. Application is by a long-handled steel spreader. Two coats are often applied. Finishing can be done by broom or trowel. Always follow the product manufacturer’s instructions

  • specialist companies also offer concrete resurfacing services. Products are available in a variety of colours and surface finishes

Cause

Frost damage – typically with low density (poorly vibrated/finished) concrete 

Repair

  • as above

Cause

Concrete at the end of its serviceable life

Repair

  • remove existing concrete and lay a new path/driveway