Ready Mix Concrete - Definition“Ready mix concrete is concrete whosecomponents are proportioned away from theconstruction site for delivery to the constructionsite by the truck in a ready-to-use-condition.”
History In 1909, the residents ofSneridan, Wyoming couldhave witnessed the birthof Ready Mix concreteindustry. Prior to World War I,concrete was produced instationery plant mixerhauled to constructionsites in dumps trucks.Transit Mixer in late 1950’s
Need for Ready Mix concrete Requirement for higher grades of concrete Correct accountability ingredients Rapid development of infrastructure industry Increased demand of concrete Possibility of manufacture of desired grades Mega project demands higher output Timely supply of reliable concrete
Progressive growth of Ready mix concretein IndiaPHASE TIME PERIODIN YEARSCEMENTCONSUMPTIONIN %VOLUME OFR.M.C PERYEARPHASE I 1992-2010 5-10% of cementconsumption20 million cubicmeter/RMC/yearPHASE II 2020-2050 20-25% of cementconsumption70 million cubicmeter/RMC/yearPHASE III 2050 Onwards 25-40% of cementconsumption100 - 150 millioncubicmeter/RMC/year
Advantages Of Ready Mix Concrete Quality assurance Elimination of manual errors Mass production of concrete possible Water cement ratio maintained Reduced material wastage Labour cost saved Design mix as per IS standards resulting in standarddeviation and improved characteristics.
Disadvantages Of Ready Mix Concrete The materials are batched at a central plant, andthe mixing begins at that plant Generation of additional road traffic; furthermore,access roads, and site access have to be able tocarry the weight of the truck and load. Concretes limited time span between mixing andgoing-off