What you need to know about concrete cracks and repairs

  • Share This Article

As you may know, concrete may be durable but it’s still susceptible to damage. Cracks can appear for multiple reasons; whether it be as a result of structural movement, bearing excess load or exposure to the elements. Below we discuss what you need to know about these cracks to help with their repair:

Active or dormant?

Before you begin any concrete repairs, consider whether there is an underlying problem. If the concrete is cracking due to an overload on the structure, a repair will be a short-term resolution. Cracks will reappear in new places and ultimately cost more to repair.

If the crack has the potential to grow in size, it can be labelled active. A crack that is active threatens the safety of a structure and a structural engineer must be consulted. Dormant cracks, on the other hand, are less urgent and can be sealed and waterproofed until later action can be taken.

How do I repair the damage?

There are multiple ways that concrete can be repaired depending on the damage and, of course, whether the crack is active or dormant.

Dormant fracture repair

For dormant fractures, repairs can be accomplished by using a rigid filler or epoxy injection. This will stabilise the damage and reduce the risk of any further damage by being packed into the crack. We recommend a specialist observe the fracture before action is taken to ensure your repair material is appropriate for the type of damage that has been caused.

Active fracture repair

Again, for active damage to concrete structures, assess the situation with a structural engineer. Concrete damage is particular to each case and gaining professional advice and assistance will ensure the correct repair materials and processes are chosen to reduce further risks. When considering how to repair active fractures, it is worth considering the use of a flexible material in order to allow any future movement as active cracks can be working joints (this is particularly the case for concrete slabs). Elastomeric sealants can be used to enable movement without resulting in further cracks.

For further information or to get expert assistance with your concrete repairs, get in contact with us at Murphys Remedial Builders today.

Leave a Comment

Our Contact Details
Murphys Group Services

Head Office
60 Cope Street
Redfern NSW 2016

Postal Address
PO Box 3136
Redfern NSW 2016


Why is scaffolding so useful?


Benefits of a concrete floor coating