Types of Ready Mix Concrete Plants
Following are the different types of ready-mix concrete plants and their mixing actions:
Dry batch concrete plant
Wet batch concrete plant
Half-wet batch concrete plant
Combination batch concrete plant
Dry Batch Ready Mix Concrete Plants
This type of ready-mix concrete batching plant produces uniform concrete mix through the mixing action of the truck mixer. The mixing action is basically a twofold mechanism. Consider the complex movement of already well-mixed plastic concrete in the drum.
In the beginning, neglect the blade action, the rotation of the drum and both concrete internal friction of the concrete and its friction against drum inside surface make the concrete appears to move up the right-hand wall of the drum as shown in Figure-2.
There are two factors which affect the height that the concrete can climb up before gravity surpasses it and make it to fall. Firstly, drum surface linear velocity which based on its angular velocity and the inside diameter of the drum. Concrete falling point is increased with increasing linear velocity. Secondly, concrete workability which its decline leads to rise concrete falling point.
It is observed that, at speed of 22-27 rpm (normal speed is 10-14 rpm), the concrete spins full contact with the drum surface hence concrete falling will no longer exist. This may lead to create problems because substantially efficient local mixing will be lost if the concrete falling point is avoided.
Wet Batch Ready Mix Concrete Plants
There are various types of wet batch systems and the wet batch system is a plant-based mixer. This means that different component of concrete mixtures such as cement, aggregate, and water is mixed in the system.
Comparatively, the output of the wet batch concrete plant is greater than the dry batch concrete plant that is why it is frequently seen as large plants. Moreover, the wet batch concrete plant is necessary in the case mortar production is required.
There are different mixers sizes that range from 0.8 m2 to 6 m2 and the largest mixer drum can adequately mix about 6 m2 plastic concrete in around forty-five seconds.
Furthermore, there are several factors, for example, required to output, the predominant type of mixes supplied, plant geometry, available space, initial and entire life expenses, upon which specific mixer is decided to be chosen.