Which of the following is an example of coarse aggregate used in concrete?

• A. Sand
• B. Gravel
• C. Water
• D. Cement

Answer: (B)

Coarse aggregate in concrete means the larger particles that provide the main load-bearing structure and bulk of the mix. Fine aggregate like sand fills small voids and works with the cement paste, while the coarse portion supplies strength and reduces the amount of cement paste needed. Among the options, sand is too small to be coarse aggregate, water isn’t an aggregate and acts as a fluid in the mix, and cement is the binding material. Gravel fits as coarse aggregate because its larger particle size serves as the main inert filler that bonds with the cement paste to give concrete its strength and durability.