Cementious Concrete Floor Repair
Definition of Cementitious Concrete Repair
Any repair material in which main constituent is cement
Typical Uses
Repairing concrete floor, damaged concrete, walls, ceilings, freezer floors, bridge structures, bridge decks, car park columns and piers, tidal situations, steps and stairs etc
Our Concrete Repair Products
When would I use this product?
To repair and make good intentional damage to concrete such as chasing conduit, or imperfections experience after pouring concrete. Plus accident damage such as driving a truck into a wall or subsidence induced cracks – basically anywhere concrete is damaged. If you would like help and guidance on selecting the right concrete repair product for your application please use our ‘Ask the Doc’ service.
Method/Application
There are three broad categories for concrete repair products
- Lightwieght materials used on overhead repairs to 75mm or vertical repairs which need building up to a max of 100mm
- Standard repairs for floors, paths, steps
- High strength repairs for areas where there is structural concrete such as bridges or tunnels
It is necessary to prime areas that are subject to repair, whether it is with a purpose designed primer, clean water or slurry coat of the materials itself. In cases where steel is exposed it should be primed separately to prevent corrosion and applied in accordance to manufacturers recommendations.
For all concrete repairs you will need to work to a square (or vertical edge) whether cut with a grinding wheel or saw or chopped in using a chisel.
As a rule of thumb the minimum thickness is 10mm. You can’t feather edge cementitious concrete repairs (if you do they soon lift and degrade). The area to be repaired for all concrete repairs needs to be wet down with water before beginning the repair – this is important to ensure the ‘mixing water’ or liquid is not sucked out of the repair compound. Ensure no ‘puddles’ are left in the repair area. All cementitous repair compounds should be mixed in a forced action mixer – or at the very least with a slow speed drill and paddle.
Almost all repairs are placed by hand and finished by trowel. Once the repair is finished don’t forget it must be cured – either stick some plastic sheeting over it or spray with a curing membrane, remember to use a variety that would be compatible with further decoration.
When the repair is finished it may look rough or stand out from the surroundings. To address this, the manufacturers recommend a fairing coat to use with the repair material. A fairing coat is a skim coat that is designed to blend the repair patch into the surrounding concrete. This can be feather edged and applied by brush or trowel in very thin layers, typically 1 – 3mm.
Concrete Floor Repairs
When repairing a floor, the materials are very similar to lightweight products but are generally denser. Work to a square edge, prime all steel, soak the concrete before priming and cure afterwards. Normally concrete floor repair is thin i.e. less than 10mm switch to epoxy repair materials.
Repairs to Potable Water Structures
A number of concrete repair products have Drinking Water Inspectorate (DWI) approval so any repairs for reesviours or potable water structures must use a DWI approved material. For assistance in selecting the correct product please contact us.
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