
Cement is one of the most widely used building materials—but when wet, it can be far more hazardous than many realize. Whether you’re working with concrete every day or managing a home project, understanding how it interacts with your skin is critical for staying safe.
When water is added Portland cement, calcium hydroxide is formed. This wet cement is caustic, i.e. a pH as high as 12.9 and can produce third-degree alkali burns after 2 hours of contact. Unlike professional cement workers, inexperienced finishers are usually not aware of the danger and may stand or kneel in the wet cement for long periods..
In some cases, general physicians may not recognize the seriousness of the injury in its early stages or the significance of a history of prolonged contact with wet cement. All people working with wet cement should be warned about its dangers and advised to immediately wash and dry their skin if contact does occur.