A concrete mixer is a type of construction machinery used to mix cement, water, and aggregates (such as gravel or sand) to produce concrete for construction. Concrete mixers come in various types, including truck-mounted, portable, and stationary. Truck-mounted mixers are typically used for large construction projects, while portable mixers are more commonly used for small to medium-sized projects. Stationary mixers are typically used for precast concrete applications or large construction sites requiring a continuous supply of concrete. Concrete mixers have revolutionized the construction industry by making the concrete mixing process faster, more efficient, and more consistent.