According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm^2) can be taken as

- 1
  
  Ec = 5700√fck
- 2
  
  Ec = 570√fck
- 3
  
  Ec = 5700fck
- 4
  
  Ec = 700 √fck

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