Methods of Concrete curing : Site vs Guidelines in the Code

 Methods of Curing Concrete: Site vs Guidelines in the Code


One of the most important steps in the construction of concrete structure is curing yet it is most of the time the neglected part on-site. Even though design and mixing are refined, poor curing may end up destroying the durability of even the best concrete in the long term. This blog pits site curing as it is practiced on sites against the guidelines that are provided regarding the same in IS codes, and investigates the way to get the two to meet.

The reasons to cure:

Curing entails ensuring that the concrete has the right level of moisture, temperature and time in order to develop the required strength and durability. The result of poor curing is:

  • Surface cracks
  • Decreased compressive strength
  • Scaling and dusting
  • The poor abrasion resistance

Code Guidelines of Curing (IS:456):

In accordance with the provisions of Indian Standard IS 456:2000 (Clause 13):

IS recommended curing time:

7 days of Ordinary Portland Cement (OPC)

10 days in case of blended cements such as PPC, PSC

hot/dry weather 14 days or with mineral admixtures

Curing is to commence when the surface is firm enough not to be damaged.

The most common ones are listed as:
  • Ponding
  • Wet covering
  • Sprinkling
  • Membrane curing

General Practices on site:
What Occurs in Majority of Construction Sites:


Site vs Code : The Reality 

Most Important Things to do to Cure:

  • Begin to cure as soon as formwork is removed or as early as it may set.
  • In areas where there is no constant supply of water, employ the use of curing compounds.
  • Surfaces should be kept wet at all times, more so slabs, columns, and beams.
  • Lengthen curing time when temperatures are hot, or when admixtures are provided.
  • Cure train the labor in what and how to cure.
  • Keep quality documentation on curing records.

Novel Curing Solutions:

  • Curing Blankets: Cold weather insulated blankets
  • Automated Sprinklers: less work, more consistency
  • Moisture Sensors: Moisture Sensors using IOT: The sensors will be used to track the hydration in real-time

Conclusions:

Would one call proper curing a luxury? No, it is a necessity. Although the goal of most site teams is product speed and cost effectiveness, failure to cure properly results in long term durability problems, repairs and eventual structural failure. To comply with IS code practices at the sites is to enhance the concrete performance besides the quality assurance and the satisfaction of the clients.







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