What type of masonry unit is commonly used for structural applications?

Concrete block is commonly used for structural applications due to its strength, durability, and versatility. Concrete blocks, also known as concrete masonry units (CMUs), are designed to bear significant loads and withstand various weather conditions, making them ideal for building walls, foundations, and other structural elements in construction. Their consistent shape and size facilitate easier construction and provide reliable structural integrity.

Additionally, concrete blocks can be filled with reinforcing materials such as steel rebar and concrete for enhanced strength, thereby supporting larger structures and improving resistance to lateral forces such as wind and earthquakes. This adaptability not only contributes to the safety and stability of buildings but also allows for effective insulation when combined with insulation materials.

In contrast, materials such as paper, plastic, and fiberglass are not suitable for structural applications. Paper lacks the necessary strength and durability to perform as a reliable building material, while plastic may not provide the rigidity required for structural integrity. Fiberglass can be strong in certain contexts, but it is typically used for specialized applications rather than as a primary structural element in masonry construction.