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Deteriotion and cracks
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7. PLASTIC SHRINKAGE CRACKS
•Water From Fresh Concrete Can Be Lost By
Evaporation, Absorption By Subgrade, Formwork And In
Hydration Process.
• When The Loss Of Water From Surface Of Concrete Is
Faster Than The Migration Of Water From Interior To
The Surface, The Surface Dries Up.
• This Creates Moisture Gradient Which Results In
Surface Cracking While Concrete Is Still In Plastic
Condition.
• The Magnitude Of Plastic Shrinkage And Plastic
Shrinkage Cracks Are Depending Upon Ambient
Temperature, Relative Humidity And Wind Velocity.
• In Other Words, It Depends Upon The Rate Of
Evaporation Of Water From The Surface Of Concrete.