Concrete cancer is a non-technical term used to describe advanced deterioration of concrete caused by reinforcement corrosion, leading to cracking, spalling, and structural weakening.
Explanation
The term is commonly used in the construction industry to describe the visible and progressive damage associated with steel reinforcement corrosion. It typically begins when moisture, oxygen, and often chlorides penetrate the concrete, breaking down the protective alkaline environment around the steel.
As corrosion develops, the steel expands, exerting internal pressure on the surrounding concrete. This leads to cracking, delamination, and eventual spalling of the concrete cover. In advanced stages, reinforcement may become exposed and significantly reduced in cross-section.
Concrete cancer is often associated with carbonation, chloride attack, poor cover depth, or inadequate waterproofing. It is particularly prevalent in exposed structures such as balconies, car parks, and coastal or high-moisture environments.
Although not a formal engineering term, it is widely used to describe a serious and progressive form of deterioration.
Why It Matters
Concrete cancer indicates significant underlying damage that can compromise structural safety if left untreated. What begins as cosmetic cracking can escalate into major repair or replacement requirements.
Early diagnosis and intervention are critical. Effective treatment involves removing affected concrete, treating or replacing reinforcement, and reinstating with appropriate repair and protective systems to prevent recurrence.