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For slabs and beams the grade of concrete mix generally used is

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For slabs and beams the grade of concrete mix generally used is 1: 2: 4 or 1: 1.5: 3.$

Different concrete mix proportion uses in Buildings

Foundation or PCC

1 : 4 : 8

DPC

1 : 2 : 4

Floor

1 : 4 : 8

Lintel

1 : 2 : 4

RCC Slab or Beam

1 : 2 : 4 or 1 : 1.5 : 3