Which mixing component is combined with sand in a 1:6 masonry mix?

In a 1:6 masonry mix, which consists of one part cement to six parts sand, the mixing component that is combined with sand is masonry cement. Masonry cement serves as the binder in this mixture, providing the necessary adhesive properties and strength when used in masonry applications such as bricklaying and stonework. It is specifically formulated to improve workability, durability, and moisture resistance, making it ideal for masonry structures.

Using masonry cement in this ratio ensures that the resulting mortar or plaster is well-suited for its role in binding masonry units together and for ensuring structural integrity.

The other options do not fit as the main component in this context. Hydrated lime, while it can be used in some masonry mixes to enhance workability and flexibility, is not the primary binder in this specific ratio. Aggregate and gravel are not typically used in a standard masonry mix focused on bricks and blocks, as the fine sand provides the required texture and consistency for this application.