What are aggregates in construction?

• A. Metals in steel production
• B. Granular raw materials like limestone and clay used to provide volume, stability, and strength to concrete
• C. Consumers in market research
• D. Data analytics

Answer: (B)

Aggregates are granular, inert materials that form the bulk of concrete. They include natural or manufactured materials like limestone, gravel, sand, and crushed rock. Their job is to provide volume and stability, carry the load within the concrete, and help achieve the required strength and durability when combined with cement paste. By filling most of the space in the mix, aggregates reduce the amount of cement needed, which lowers cost and improves workability and shrinkage control. They differ from items like metals, consumer groups in market research, or data analytics, which relate to other areas outside concrete construction.