CCommunity
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