Concrete repair is not necessarily an easy job to do, due to different types and sizes of the damage and also possible causes of that. However, in this article, we explain a simple methodology of repairing concrete with minor damages and domestic applications. For more information on the possible causes of the concrete deterioration & cracks and how to repair them, you may consult with "HB 84-2006 Guide to Concrete Repair and Protection", Standards Australia.
Epoxy-based mortars and crack fillers are the most durable and high performance products for small size repairs and crack filling. Note that epoxy-based repair might not be the best option for large scale repairs.
1- Clean the Damaged Area
To prep a small crack/damage rinse it out with water and allow it to dry thoroughly. Also use a steel scrub brush to knock any loose particles away from the crack/damage. If there is any loose pebbles or particles in the crack or hole use an air blower or vacuum to remove them.
2- Apply the Crack Filler
Use an epoxy crack filler (Epoxymix- Crack Repair MV) in a caulking tube to fill in the small cracks, forcing it into the crack to seal it and prevent water from leaking into the concrete. The tip of the caulking tube will smooth the mortar repair a bit; you can do the rest of the smoothing with your finger or a spatula.
3- Apply the Patch Material
To repair larger cracks or holes, make a batch of Concrete Repair Epoxy Mortar, which you can buy even in small pails. Mixing is easy, take a little bit of part A with the same volume of part B and mix them manually or with a spatula.
4- Patch the Larger Holes
Using a pointing trowel, push concrete patch into the holes and/or "build" missing segments of concrete, and then smooth the concrete patch using a trowel or spatula. Remember, to check the pot life and know how long it takes before the mixed product goes off.