There are lots of different types of concrete plants. They can be classified by what they are producing concrete for, the hourly production, the way the proportion materials and even the way they are constructed. First, it is important to know that concrete plant can be considered any machine that proportions the materials for concrete and then moves the materials to a mixer. Some concrete plants like precast, paving, and central mix include a mixer as part of the plant, while other concrete plants like ready-mix will use a mobile mixer usually mounted on a truck. Small contractors or users of concrete will frequently use a small drum mixer and shovel materials into it; this is not a concrete plant, just a mixer being fed manually.