What is Ready Mixed Concrete?
As the name indicates, Ready Mixed Concrete (RMC) is the concrete which is delivered in the ready-to-use manner. RMC is defined by the American Concrete Institute’s Committee 116R-90 as:
“Concrete that is manufactured for delivery to a purchaser in a plastic and unhardened state”.
The Indian Standard Specification IS 4926:2003 defines RMC as:
“Concrete mixed in a stationary mixer in a central batching and mixing plant or in a truck-mixer and supplied in fresh condition to the purchaser either at the site or into the purchaser’s vehicles”.
In India, concrete has traditionally been produced on site with the primitive equipments and use of large labour force. Ready mixed concrete is an advanced technology, involving a high degree of mechanization and automation. A typical RMC plant consists of silos and bins for the storage of cement and aggregates respectively, weigh batchers for proportioning different ingredients of concrete, high efficiency mixer for thorough mixing of ingredients, and a computerized system controlling the entire production process. The quality of the resulting concrete is much superior to site-mixed concrete.
Site Mixed Versus Ready Mixed Concrete
Technologically speaking, ready mixed concrete is certainly an advancement over the age-old site mixed concrete. The benefits of RMC in terms of quality, speed, life-cycle cost and environmental friendliness are overwhelmingly superior to those of site mixed concrete.