Why does concrete shrink during mixing?

Concrete shrinks when water fills the air voids between cement particles. To compensate, a dry volume multiplier of 1.54 is standard in civil calculations.

What mix ratio is M20 concrete?

M20 grade concrete has a volume ratio of 1:1.5:3 (1 part cement, 1.5 parts sand, and 3 parts aggregate).

Concrete Calculator

Online Concrete Calculator. Calculate concrete dry volumes, bags of cement, sand, and aggregate needed for rectangular slabs, beams, or columns.

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