Coarse aggregate may include which of the following?

Coarse aggregate primarily consists of larger particles or fragments used in concrete and other construction materials. The correct answer encompasses materials commonly categorized as coarse aggregates, which include gravel, crushed gravel, and crushed stone. These materials are essential for providing structural support, aiding in the mixing process, and influencing the durability and strength of the final concrete mix.

Gravel is a naturally occurring aggregate material composed of rock fragments and is often used in concrete for its density and strength. Crushed gravel is the product of mechanical crushing of gravel and is similarly used to create a robust concrete mix. Crushed stone, typically made from larger rocks, provides great strength and is commonly used in various construction applications.

The other options do not fit the conventional definition of coarse aggregate as closely. River sand, for instance, is classified as fine aggregate, which consists of smaller particles that fill the voids between coarse aggregates. Crushed glass is not typically used as a conventional coarse aggregate in concrete due to issues related to its properties and processing. Building debris may consist of various materials, some of which could be classified as aggregates, but it is not a standard source of coarse aggregate in concrete mixes. Thus, the inclusion of gravel, crushed gravel, and crushed stone accurately reflects recognized materials used as