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Yes in India, the guidelines are expressed under following codes. a)IS 10262 (2009): Guidelines for concrete mix design proportioning b) IS 456 (2000): Plain and Reinforced Concrete – Code of Practice
For M20 nominal mix concrete the mentioned mix is used, For reference only you can refer to IS 456, page number 23, link: http://civilengineer.co.in/wp-content/uploads/2015/02/IS-456-2000-Plain-Reinf-Concrete.pdf
