Fine aggregates are small particles used in construction, primarily in concrete and mortar. They typically consist of sand, silt, or crushed stone, with particle sizes ranging from 0.075 mm to 4.75 mm. These materials help improve the workability and strength of concrete mixtures. In addition to providing structural support, fine aggregates fill the spaces between larger particles, reducing voids and enhancing the overall density of the mix. Common sources of fine aggregates include natural river sand and manufactured sand, both of which play a crucial role in the quality of construction materials like concrete and mortar.