Lågkloridmaterial

Lågkloridmaterial refers to materials designed with a low chloride ion content to minimize the risk of chloride-induced deterioration in structures, particularly those with reinforcing steel. Chloride ions can compromise the protective passive layer on steel and accelerate corrosion, especially in environments exposed to seawater, de-icing salts, or other chloride sources. By reducing the chloride content in cementitious systems and related products, these materials aim to extend the service life of constructions in aggressive exposures.

Common types include low-chloride cement or cementitious blends, concretes and mortars formulated to contain minimal chlorides, and mixtures that rely on supplementary cementitious materials such as fly ash, slag, or silica fume to lower chloride diffusion. In some cases, manufacturers provide binders or admixtures that further limit chloride ion availability or ingress. The use of coatings and sealants can also complement low-chloride materials to improve durability.

Applications are most common in reinforced concrete structures located in coastal zones, in tunnels, bridges, parking garages, and other facilities with elevated chloride exposure. Standards and best practices typically specify maximum chloride content or diffusion characteristics for materials used in such structures, with requirements varying by country and by the intended exposure and reinforcement details.

Advantages of laagkloridmaterial include reduced risk of corrosion, potentially longer service life, and easier compliance with durability targets in chloride-prone environments. Potential drawbacks can include higher material costs, limited availability of some low-chloride products, and the need to ensure compatibility with the overall mix design and performance criteria.

See also: chloride-induced corrosion, reinforced concrete, durability of concrete, supplementary cementitious materials.