Curingsweating

Curingsweating is a term used in construction and materials science to describe the visible appearance of moisture on the surface of a material while it is curing. It typically refers to the migration of internal water to the surface during early hydration or drying, which can condense as droplets under certain temperature and humidity conditions. The phenomenon is sometimes called surface sweating or moisture migration during curing.

Causes of curingsweating include high ambient humidity, elevated temperatures that drive vapor toward the surface, and low permeability of the substrate or finish that traps internal moisture. It is commonly observed in concrete and plaster when the interior moisture content is still high and the surface cools below the dew point. The presence of water at or near the surface can interact with curing compounds, finishes, or coatings and influence surface appearance and adhesion.

Impacts vary by material and application. Curingsweating can cause staining, delayed finishing, or poor bond strength for subsequent coatings if moisture remains trapped. In concrete, persistent surface moisture may contribute to efflorescence or surface blemishes if salts are present.

Prevention and management focus on controlling the curing environment and surface conditions. Measures include regulating ambient temperature and humidity, protecting the surface from rapid temperature changes, using appropriate curing techniques or membranes, and scheduling finishes after sufficient moisture loss. Moisture testing and dew-point calculations can help determine suitable timing for additional work.

See also: curing, moisture migration, efflorescence, condensation.