A Volumetric concrete mixer is a mixing device that measures the raw materials using volume rather than weight.
The volumetric mixer blends the concrete mixture using an auger or a paddle or a drum device to mix the ingredients with water.
The volumetric mixing process starts with a batch metering system that allows the volume of raw materials to be measured prior to entering the mixing chamber. This process can be as simple as using a measured bucket, to highly sophisticated and computerized batch plants that feed the correct volume.
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—Salvador Dali (1904–1989)