What does sacking involve in terms of concrete surface preparation?

Sacking refers to the process of scrubbing a mixture of cement mortar over a concrete surface. This technique is often employed to enhance the surface profile, improve adhesion for subsequent coatings, and provide a uniform appearance on the concrete. The mortar fills in voids and irregularities, creating a more even surface for coatings to bond effectively.

Using a mixture of cement mortar allows for the repair of minor imperfections while also ensuring that the concrete surface has the necessary texture for optimal coating performance. This is particularly important in protective coatings applications, where a well-prepared surface significantly contributes to the longevity and durability of the applied coatings.

Other methods like using a carborundum brick, applying a layer of paint, or jet blasting serve different purposes and do not align with the specific function of sacking in terms of preparing a concrete surface for coating.