In what form is Portland cement primarily used?

Portland cement is primarily used in the production of mortar, which is a mixture of cement, water, and aggregates. Mortar is essential in construction as it is employed to bind bricks, stones, and masonry units together, providing strength and stability to structures. The chemical composition and properties of Portland cement make it an ideal binding agent, capable of hardening and gaining strength over time when mixed with water.

While other options like insulation, landscaping, and decorative purposes may involve other materials or forms of cement, they do not represent the primary use of Portland cement. Insulation materials generally refer to products designed to reduce heat transfer, landscaping often uses concrete or other mixtures, and decorative purposes may include colored or textured variations, which are not the primary function of Portland cement itself. Therefore, focusing on its role in creating mortar highlights the essential function of Portland cement in the construction industry.