What is one of the primary functions of mortar in masonry?

One of the primary functions of mortar in masonry is to bond masonry units together. Mortar acts as a cohesive agent that fills the gaps between bricks, blocks, or stones, creating a solid bond that helps to ensure structural integrity. This bonding capability is crucial because it not only holds the masonry units in place, but it also aids in distributing loads and stresses throughout the structure, preventing individual units from shifting or separating.

While other functions such as providing thermal insulation or enhancing color may seem relevant, they are not the primary role of mortar. Mortar does contribute to some thermal properties and aesthetics, but its fundamental purpose is to create a strong, durable connection between masonry units, which is essential for the overall stability and longevity of masonry walls.