About Concrete Peeling and Concrete Cancer Concrete Peeling describes the state in which concrete begins to degrade or peel off. Common signs include cracking, crumbling or peeling of concrete, rust stains or bubbles in concrete or cement plaster, and leaks in the ceiling and walls. Chipping is a term used to describe areas of concrete that have cracked and delaminated from the substrate. There are several reasons why husking occurs, including freeze-thaw cycles, the expansive effects of the alkaline silica reaction, or exposure to fire.
However, the most common cause of chipping is corrosion of embedded steel reinforcing bars or steel sections. Corrosive steel can expand up to ten times its original volume, putting stress on the surrounding concrete. There are also serious business considerations. If a structure is allowed to deteriorate, the value of the asset will decrease and, in addition, maintenance costs will tend to increase as corrosion and scaling become more widespread.
For some structures, such as car parks, customers will stay away if the environment is unattractive and potentially dangerous. The peeling of concrete, especially on the outside of a building, not only looks terrible, but is also potentially dangerous. Over time, and with increased exposure to the elements, untreated pieces of concrete may fall out of the structure. The risk is that it will fall and damage property, or even worse, that it will hit a person walking underneath.
Concrete peeling affects a wide variety of structures, including concrete framed buildings, multi-storey car parks, bridges, jetties, tanks and ponds. The word “chipping” refers to the breaking of a material into pieces, in particular cracks below the surface that cause part of the surface to peel off. So, what exactly is chipping? What are their effects and how can structures be successfully repaired and further corrosion prevented? Chipping can be inconsequential, that is, a purely aesthetic problem, or it can cause serious structural damage requiring costly remediation work. Appropriate mixing of sand, cement and aggregates must be achieved, as insufficient aggregate can result in a weak and prone top layer to chip.
Unfortunately, an adhesive plaster approach is often taken to repair peeling structures, without treating the underlying causes. Beyond the obvious aesthetic problems, a reduction in cross-sectional area due to flaking and delamination is synonymous with a weakened concrete section. If peeling has already occurred, damaged bricks can be replaced, but the cause of moisture must also be properly identified and treated. The reason why some concrete structures exhibit widespread flaking, while others appear to be in good condition is due to a combination of age, maintenance, concrete quality, concrete cover depth and local environmental conditions.
And, if you have chipping, have it treated as soon as possible to maintain the structural integrity of the concrete as much as possible. The descaling of the concrete normally begins when the steel reinforcement embedded within the concrete member is oxidized. In construction, “peeling” refers to the flaking, cracking, peeling, crumbling or chipping of concrete or brick, particularly when parts of the surface can be said to have “peeled off”. Measures can be taken to prevent flaking when the concrete is first poured, as the concrete mix will influence the likelihood of its flaking in the future.