page_title: Concrete mixer
section_title: Industrial mixers
hierarchical_section_title: Concrete mixer / Industrial mixers
caption_attribution_description: English: Twin shaft concrete mixer
context_page_description: A concrete mixer is a device that homogeneously combines cement, aggregate such as sand or gravel, and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works, portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens. An alternative to a machine is mixing concrete by hand. This is usually done in a wheelbarrow; however, several companies have recently begun to sell modified tarps for this purpose.
  The concrete mixer was invented by Columbus, Ohio industrialist Gebhardt Jaeger.
context_section_description: Today's market increasingly requires consistent homogeneity and short mixing times for the industrial production of ready-mix concrete, and more so for precast/prestressed concrete. This has resulted in refinement of mixing technologies for concrete production. Different styles of stationary mixers have been developed, each with its own inherent strengths targeting different parts of the concrete production market. The most common mixers used today fall into three categories:
  Twin-shaft mixers, known for their high intensity mixing, and short mixing times. These mixers are typically used for high strength concrete, RCC and SCC, typically in batches of 2–6 m³ (2.6–7.8 cu yd).
  Vertical axis mixers, most commonly used for precast and prestressed concrete. This style of mixer cleans well between batches, and is favoured for coloured concrete, smaller batches (typically 0.75–3 m³ or 0.98–3.92 cu yd), and multiple discharge points. Within this category, the pan mixers are losing popularity to the more efficient planetary (or counter-current) mixers, as the additional mixing action helps in production of more critical concrete mixes (colour consistency, SCC, etc.).
  Drum mixers (reversing drum mixer and tilting drum mixers), used where large volumes (batch sizes of 3–9 m³ or 3.9–11.8 cu yd) are being produced. This type of mixer is capable of high production outputs.
  All the mixer styles have their own inherent strengths and weaknesses, and all are used throughout the world to varying degrees of popularity.
caption: Twin shaft concrete mixer for concrete plant
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