Concrete spalling is the cracking or breaking down of concrete due to the corrosion and expansion of the inner steel reinforcements. When concrete is used in construction, steel bars or steel mesh can be used inside the concrete slab as reinforcement, but when exposed to air or water, the steel reinforcements can corrode, which causes the reinforcements and thus the concrete to expand. Concrete spalling is a common building condition, and is especially prevalent in buildings which are close to saline environments, such as ones along the coastline. It is also called “concrete cancer” due to the progression of the corrosion. Once the concrete has cracked, it further exposes the steel to water and air, speeding up the process.