Fly ash bricks are building materials made from fly ash, a byproduct of burning coal in power plants. These bricks are lightweight, strong, and environmentally friendly, as they utilize waste material that would otherwise contribute to pollution. They are often used in construction for walls, pavements, and other structures. The production of fly ash bricks involves mixing fly ash with water, lime, and other additives, which are then molded and cured. This process results in bricks that have good thermal insulation properties and can help reduce energy consumption in buildings. Their durability and resistance to weathering make them a popular choice in modern construction.