Fine aggregates are small particles used in construction, typically consisting of sand or crushed stone. They play a crucial role in creating concrete and mortar, providing bulk and strength to the mixture. Fine aggregates usually pass through a sieve with a mesh size of 4.75 mm, ensuring they are small enough to fill gaps between larger particles. These materials help improve the workability and durability of concrete. Common sources of fine aggregates include natural sand, manufactured sand, and recycled materials. Proper selection and grading of fine aggregates are essential for achieving the desired properties in construction projects involving concrete and mortar.