Condition for crack

Condition for crack

• Cracking in a member is developed when the member is subjected to an external 

load more than 0.2 fck Ac

• External Load P > 0.2 fckAc

fck = characteristic strength of concrete

Ac = Area of concrete

• Crack width in member should not be greater than 0.3mm for mild exposure 

and 0.2mm for moderate exposure and 0.1mm for serve, extreme & very severs 

exposure.

Not greater than 0.3mm for mild exposure Not greater than 0.2mm for moderate exposure

 Not greater than  0.1mm for severe, Extreme & very serve exposure.