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Rmc

A study material On Ready Mix Concrete and the process involved in it.

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Rmc

  1. 1. “Ready mix concrete is concrete whose components are proportioned away from the construction site for delivery to the construction site by the truck in a ready-to-use-condition.”
  2. 2.  In 1909, the residents of Sneridan, Wyoming could have witnessed the birth of Ready Mix concrete industry.  Prior to World War I, concrete was produced in stationery plant mixer hauled to construction sites in dumps trucks.  In India RMC was first initially was used in 1950 during the construction sites of Dams like like BhakraNangal, Koyna. At the construction the transportation of concrete is done by either manually or mechanically using ropeways &buckets or conveyor systems. Transit Mixer in late 1950’s
  3. 3.  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
  4. 4.  Raw Materials are:-  1. Water  2. Additives  3. Cement  4. Aggregate  5. Air
  5. 5.  Aggregates, which make up roughly 60% to 75% of ready mix concrete’s volume, are obtained from quarries and aggregate banks.  Additives are solid or liquid chemical substance that can be added to ready mix concrete before or during preparation.  ·Most commonly used additives either improve a hardened concrete’s durability or reduce a concrete’s water content in an effort to shorten setting times.
  6. 6.  No others material rivals cement’s important in the mix; it’s the ingredient that gives concrete its strength.  The most widely used cements are gray Portland type 1 and Pozzolona Portland type 2.
  7. 7.  Following are the equipment’s required in R.M.C  1. Batching plant  2. Silos  3. Belt Conveyor  4. Transit mixer
  8. 8. Batching plants are classified as  1. Manual  2. Semiautomatic  3. Fully automatic
  9. 9.  While transporting concrete to a site, the cement mixer never stops revolving at a speed of two to six rotations per minute.
  10. 10. PHASE TIME PERIOD IN YEARS CEMENT CONSUMPTION IN % VOLUME OF R.M.C PER YEAR PHASE I 1992-2010 5-10% of cement consumption 20 million cubic meter/RMC/year PHASE II 2020-2050 20-25% of cement consumption 70 million cubic meter/RMC/year PHASE III 2050 Onwards 25-40% of cement consumption 100 - 150 million cubic meter/RMC/year
  11. 11.  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 standard deviation and improved characteristics.
  12. 12.  The materials are batched at a central plant, and the mixing begins at that plant  Generation of additional road traffic; furthermore, access roads, and site access have to be able to carry the weight of the truck and load.  Concrete's limited time span between mixing and going-off

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