Red Seal Concrete Finisher Practice Exam

The primary purpose of adding aggregates to concrete is to provide strength and stability. Aggregates, which include materials like sand, gravel, and crushed stone, contribute significantly to the overall structural integrity of the concrete. They provide mechanical interlock and resist loads, making the concrete more durable and able to withstand various stresses and environmental conditions.

When the correct aggregate sizes and types are chosen, they fill voids in the mix and create a denser material, which enhances the compressive strength of the concrete. This is essential for ensuring that the final product can support the intended loads in construction applications, such as in foundations, walls, and pavements.

While aggregates can influence the appearance of concrete, it's not their primary function. Changing the color of the concrete is often addressed through other materials or additives designed for that specific purpose. Similarly, while using aggregates can help manage costs to some extent—since they are often less expensive than cement—the primary purpose of aggregates is not cost reduction. Lastly, while adding aggregates does result in increased volume, the main goal behind their inclusion is focused on enhancing strength and stability rather than merely increasing volume.