aplant, also known as a batch plant, is a device that combines various ingredients to form concrete. some of these inputs include sand, water, (rocks, gravel, etc.), fly ash, potash, and . there are two types of concrete plants: ready mix plants and central mix plants.
a concrete plant can have a variety of parts and accessories, including but not limited to: mixers (either tilt-up or horizontal or in some cases both), cement batchers, aggregate batchers, conveyors, radial stackers, aggregate bins, cement bins, heaters, chillers, cement silos, batch plant controls, and dust collectors (to minimize environmental pollution).
the center of concrete batching plant is the mixer. there are three types of mixer, tilt, pan, and twin shaft mixer. the twin shaft mixer can ensure even mixture of concrete and large output, while the tilt mixer offers a consistent mix with much less maintenance labor and cost.
concrete plant types
a ready mix plant combines all ingredients except for water at the concrete plant. this mixture is then discharged into a ready mix truck (also known as a concrete transport truck). water is then added to the mix in the truck and mixed during transport to the job site.
a central mix plant combines some or all of the above ingredients (including water) at a central location. the final product is then transported to the job site. central mix plants differ from ready mix plants in that they offer the end user a much more consistent product, since all the ingredient mixing is done in a central location and is computer-assisted to ensure uniformity of product. a temporary batch plant is similar to the central batch plant but it can be constructed on a large job site. a concrete plant becomes central mix with the addition of a concrete mixer.
automation and controls
modern concrete batch plants (both ready mix and central mix,) employ computer aided control to assist in fast, accurate measurement of input constituents or ingredients, as well as tie together the various parts and accessories for coordinated and safe operation. with concrete performance so dependent on accurate water measurement, systems will often use moisture probes to measure the amount of water that is part of the aggregate (sand and rock) material while it is being weighed, and then automatically compensate the mix design water target.
there are two main events for manufacturers of concrete plants: world of concrete and conexpo-conagg. world of concrete occurs every year; conexpo-conagg occurs only once every three years and is the largest concrete exhibition in the industry.
concrete plant manufacturers bureau
a non-profit association brings together all of the main concrete plant manufacturers on common matters related to the industry. according to the cpmb’s website, “the national ready mixed concrete association (nrmca) endorses the members of the concrete plant manufacturers bureau as the preferred providers of concrete plants and associated equipment as providing quality equipment conforming to the standards and specifications of nrmca’s plant certification program and the concrete plant manufacturers standards.”