Lightweight aggregate is a type of construction material made from natural or artificial substances that have a lower density than traditional aggregates like sand or gravel. Common materials used to create lightweight aggregates include expanded clay, expanded shale, and pumice. These aggregates are often used in concrete to reduce the overall weight of structures, making them easier to transport and handle. The use of lightweight aggregate can improve the thermal insulation properties of concrete, making it more energy-efficient. Additionally, it can enhance the durability and workability of concrete mixtures. This makes lightweight aggregate a popular choice in various construction applications, including high-rise buildings and precast concrete products.