Have you ever wondered why buildings under construction are sprayed with water from time to time?
Unknown to many, the 'ritual' is called concrete curing which is solely aimed at improving the stability and durability of the building in the long run.
If not done correctly, cracks form on the building due to plastic shrinkage, drying shrinkage, and thermal effects.
Additionally, another disadvantage is the surface is coated with sand and dust which increases the chances of scrapping.
Often, curing is conducted for a period between seven to 14 days for effectiveness. It is recommended that the process should be initiated as soon as possible for effectiveness.
"It has to be started when the surface is hard enough for a person to walk over it without damage to concrete," Civil Lead, engineering, and construction experts advised.
Some of the curing methods include intermittent spraying with water, covering the concrete with water-proof paper of polythene sheets, ponding with water, etc. Advantages of the process include;
Promote hardening of the cement
One of the major functions of concrete curing is hardening the cement as the construction of the building continues. With proper curing, the durability and stability of the building are enhanced.
Additionally, the presence of water plays a critical role in initiating a chemical action that accompanies the setting of concrete.
Protect the concrete surfaces from sun and wind
With water on the surface of fresh cement, the sun and wind which carries unwanted materials will not contribute to the abrasion that leads to cracks.
Damage by the sun and the wind is mostly experienced during the hot temperatures and construction workers are encouraged to gauge the weather for the best curing method.
"Proper shade structures can save you time, money, and effort when curing concrete in hot temperatures. It is worth noting that concrete loses moisture quickly on a windy day," the Constructor remarked.
Reduce the loss of mixing water from the surface of the concrete
Adding water to concrete helps prevent the loss of mixing water initially used in the construction. The water guarantees that the concrete retains water until fully hardened.
Construction workers are urged to cover concrete with impervious paper or alternatively plastic sheets.
