korjauslaastin

Korjauslaasti, often translated as repair mortar or patching compound, is a type of cementitious or gypsum-based material used for repairing damaged or deteriorated concrete, plaster, or masonry surfaces. It is formulated to provide good adhesion, strength, and durability, allowing for the restoration of structural integrity and aesthetic appearance of the affected area.

The composition of korjauslaasti typically includes hydraulic binders such as Portland cement or gypsum, fine aggregates like sand, and various additives. These additives can include plasticizers to improve workability, accelerators or retarders to control setting time, fibers for enhanced crack resistance, and polymers for improved adhesion and flexibility. The specific formulation varies depending on the intended application and substrate.

Applications for korjauslaasti are diverse. It is commonly used to fill cracks, spalls, and holes in concrete structures like bridges, buildings, and pavements. It can also be employed to repair chipped or eroded masonry units, re-establish levels on floors, or patch damaged plasterwork. The material is usually mixed with water to a workable consistency and then applied using trowels, spatulas, or specialized patching equipment. Proper surface preparation, including cleaning and sometimes roughening the substrate, is crucial for achieving a lasting repair. The curing process is also important, often requiring damp conditions to ensure full strength development.