Feeding of Mixer Through Hopper:

Total quantity of coarse aggregates followed by the total quantity of sand and then cement is fed into the hopper. The mixer receives these ingredients from hopper in reverse order, i.e. coarse aggregates in last. This helps in pushing any part of cement or sand adhering to the mouth of the drum. This arrangement is shown in Figure.

Generally, a small amount of water is fed first followed by feeding operation through the hopper. The remaining quantity of water must be fed uniformly in part into the mixer during mixing operation but total quantity of water should be fed within one quarter of the mixing time.

Figure: Typical Hopper Fed Tilting Concrete Mixer