To develop these qualities, the prolonged hydration of cement must be encouraged. Hydration requires the presence of moisture and a favourable temperature. The ideal temperature range is 10 to 30 degrees Centigrade. Concrete should be protected from early loss of moisture or freezing.

The excessive loss of moisture can cause shrinkage cracking as strength development has not occurred to withstand the stresses resulting from the loss of volume (due to loss of water). A good curing environment should exist immediately after finishing, and for as long as possible after placing.

Suggested curing methods:

Curing Compounds

• Apply after finishing when bleedwater disappears
• Apply twice at right angles to each other to form continuous film

Covering

• Impermeable covering such as plastic sheet will trap moisture on concrete surface
• Use wet straw, hessian, sand or sawdust (avoid staining) if there are no other alternatives

Spraying

• Keep continuously wet to avoid crazing
• Use low pressure supply to avoid any surface damage

Ponding

• Build low wall and fill with water to cover slab

Allied Concrete staff are more than happy to help you with any problems or enquiries.

For more information or assistance, please don’t hesitate to call. Your call will be automatically connected to our nearest plant. (Calls from mobile phones will be directed for Auckland or Christchurch.)

DISCLAIMER: Allied Concrete has endeavoured to present the best possible information. However we accept no responsibility for the application of the principles discussed.