Spalling is most often identified by signs such as flaking (concrete spalling), rust stains that leach from the concrete. Bulging of the concrete or in some cases even fall off the building. The real problem lies within the concrete itself and is not a result of weathering.
The process can start in many ways, but generally, it is due to one of the following:
- The reinforcing steel being too close to the surface allowing water to seep through concrete and react with the steel.
- Fractures in the concrete allowing water to penetrate the concrete and react with the steel.
- Incompatible metals being used in close proximity to each other, thus causing a reaction.
- Poorly treated reinforcing steel being used in the original pour of the slab.
Spalled concrete is an eyesore and a hazard. Over time, with increased exposure to the elements, falling concrete debris causing likely injury and damage to property. Spalling concrete should be repaired immediately, as deferring the treatment will inevitably lead to increased problems into the future.
We will begin the process of concrete spalling repair by removing all loose concrete, grinding back the reinforcing steel to remove all rust, treating the steel with anti-corrosives. Then patching the repair with a top quality concrete to match the original surface.