What is the primary purpose of grout in masonry construction?

The primary purpose of grout in masonry construction is to fill voids within masonry units, but it also plays an important role in reinforcement. Grout is a mixture of cement, water, and sometimes fine aggregates, and it is designed to flow easily into the spaces between masonry units such as bricks or blocks. This filling action is crucial as it enhances the structural integrity of the masonry assembly by bonding the units together and providing additional strength.

While grout does help in reinforcing the structural system, its essential function is to fill those voids that exist in the system. By filling these gaps, grout ensures that the masonry wall can support loads effectively and withstand environmental conditions, thereby preventing issues such as cracking or structural failure. The cohesive properties of grout combined with its ability to flow into and fill spaces make it indispensable for creating a solid, unyielding unit of masonry.

Grout may not primarily serve as insulation, nor is it typically used for aesthetic purposes. Its design and application are centered on structural performance, making its role critical in the longevity and durability of masonry structures.