History
The history of volumetric mixing comes from several directions;
- The mobile auger mixer was invented in 1964 by Harold Zimmerman, Ephrata, PA USA. His design allowed all of the ingredients (sand, stone, water, and cement) necessary to produce the concrete to be stored in separate bins and compartments directly on the batching unit.
- The drum for trailer mounted volumetric mixer was designed in 1979, by Fred Caron and Neal Surry, Sacramento, California USA. They mimicked the larger transit-mix truck's mixing drum, on a smaller scale and loaded the drum from a batching unit that metered the volume.
- The paddle mixers exact history is unrecorded, but these volumetric mixers have been in use by masons for at least 50-years. Usually these produce smaller batches.
Read more about this topic: Volumetric Concrete Mixer
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