A concrete mixer is a machine used in construction to mix cement, aggregates (such as sand or gravel), and water into a homogeneous mixture known as concrete. These mixers come in various sizes and types, ranging from small portable units suitable for DIY projects to large industrial mixers used in commercial construction.

The most common types of concrete mixers include drum mixers, where materials are mixed as the drum rotates; twin-shaft mixers, which use two horizontal shafts with paddles to thoroughly mix the ingredients; and planetary mixers, which have a rotating pan and mixing blades that move in multiple directions for thorough mixing. Concrete mixers are essential for producing consistent, high-quality concrete on construction sites, ensuring that the concrete meets the required strength and durability standards for various applications.