Coarse aggregates are large particles used in construction materials, primarily in concrete and asphalt. They typically consist of gravel, crushed stone, or recycled concrete, and their size usually ranges from 4.75 mm to 80 mm. These aggregates provide strength and stability to structures, making them essential for building foundations, roads, and bridges. The quality of coarse aggregates affects the durability and performance of the final product. Factors such as shape, texture, and grading influence how well they bond with cement and other materials. Proper selection and testing of coarse aggregates ensure that construction projects meet safety and longevity standards.