Concrete plants or batch plants are devices that combine ingredients to make concrete. Ingredients used are rocks, gravel, potash, fly ash, sand and water. There are usually two types of plants. They are called ready mix plants and central mix plants. Ready mix plants mix everything but the water. The mixture is then put in giant mixing trucks and water is added. The mixture will be spun slowly
. in the giant machine during transport to the location. A central mix is combined at the plant and transported to the location. You can find more information here: http://en.wikipedia.org/wiki/Concrete_plant
