Types
The mixing chamber can vary depending upon the application and the mix design of the concrete.
In an auger type mixer, the material and water travels up the Archimedes' screw. Auger lengths can vary from about 5-feet to 15-feet, and vary in diameter and RPM. This type may be portable, but the length of the auger is a limiting factor.
A paddle mixer blends the concrete mix using a rotational motion and is used to blend finer gravels and sand, as in mortar. The majority of drum mixers are mounted on trailers and are pulled to a jobsite using a pick-up truck. These drums usually have a mixing capacity of between 1-yard and 1.75 yards (0.76 and 1.34m3) per batch.
A Paddle mixer tumbles the mixture in a folding motion using curved fins and paddles. This is the most common type of volumetric mixing. Paddle mixers usually mix in smaller batches directly on the jobsite.
Read more about this topic: Volumetric Concrete Mixer
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