High Quality Content by WIKIPEDIA articles! Volumetric concrete mixers include all mixing devises that measure the raw materials using volume rather than weight to produce a concrete mix.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.