Plastic shrinkage cracks are cracks that appear on the surface of freshly placed concrete during the furnishing process or soon after. This problem usually occurs during hot weather. These cracks are generally 1 to 2 inches deep and do not impair the strength of concrete, however they leave an undesirable appearance. WHAT CAUSES PLASTIC SHRINKAGE CRACKS? Simply put, the rapid evaporation of water from the surface of the concrete. The main causes are: WIND, HOT TEMPERATURES AND DRY CONDITIONS. SIMPLE PREVENTIVE TIPS:

  1. Thoroughly wet the sub-grade.
  2. Erect wind barriers or breaks.
  3. Fog the surface on hot days.
  4. Apply evaporation retardants such as Eucobar or Confilm to the surface during the finishing process.

Refer to NRMCA CIP 5 for detailed information on Plastic Shrinkage Cracking

 
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