Answer / md murtuza ali

concrete mix are of many types ,generally for domestic construction we use M20 grade of concrete where 'M' is the mix
of ingredients such as cement, agrregates(fine and coarse) and water and '20'refers to compressive strength of concrete for 28 days of curing with water.
steps invovlved in concrete mix are
1)collecting raw materials such as cement (43 grade or 53 grade),fine agrregate(sand)and coarse aggregate(gravel or stone)
2)batching:-weighing of all the raw materials the ratio of M20 grade of concrete should be (1:1.5:3) which means 1 part of cement,one and half part of sand and three parts of gravel with water by water cement ratio.
3)the water cement ratio should be 0.45 of all mix
4)mix the all ingredients such as cement ,affregates and water.
5)after mixing the freshly mixed concrete should be used for its application .the initial setting time of concrete is 30 mins and final setting time sholud be less than 10 hrs.
so this was about the mix design for M20 concrete.

Answer / chiru

pls refer Is 10262 and IS 456.

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