Spalling is a term used to describe areas of concrete which have cracked and delaminated from the substrate. There are a number of reasons why spalling occurs including freeze thaw cycling, the expansive effects of Alkali Silica Reaction or exposure to fire. However, the most common cause of spalling is the corrosion of embedded steel reinforcement bars or steel sections. Corroding steel can expand up to ten times its original volume, exerting stress on the surrounding concrete.

Most will try to sell you a "concrete sealer" to protect the concrete, although it may help it is not the correct way to protect concrete.  Amongst other inspection reasons the correct way to protect concrete is with a Concrete Conditioner.  Contact us to discuss...