[Manish Jain]

Curing methods 
PONDING OR IMMERSION IN WATER
The best curing method is total immersion of concrete in water . This method of total immersion is practically
not possible unless the concrete is a laboratory test specimen or a small precast member which can be easily handled and placed in the curing pond.
However, curing of flat surfaces such as those of pavements, concrete roads, sidewalks, floor slabs can be best cured
by ponding water on the exposed top surface . However, following precautions are necessary :

• Ponding water lost due to evaporation should be continuously replenished.
  
• Ponding water should also cover the corners and edges and should be able to cover the entire surface uniformly to avoid dry spots wherein curing would be deficient 
  
• Water used for curing should have identical properties as that of water used for manufacture of concrete.
  
• Water and the materials used for bunding should be free of substances that will stain or discolour the concrete surfaces.
  
• The difference in the curing water temperature and the concrete temperature should not be more that 11 °C to prevent thermal stresses that could result in cracking.
  
• Adequate water should be available at site throughout the curing period.
  
• Bunds of impervious earth or cement mortar to retain water should be maintained throughout the curing period.
  
• The height of the bunds and area of concrete surface to be ponded must be so selected that there is at least about 25 mm of water ponded on the highest surface.
  

for more details download.... 
 CURING FD.pdf