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Concrete Curing: When people think about concrete, they usually focus on the placement and finishing. In reality, one of the most important steps happens after the concrete is finished, and that is curing. Proper curing directly affects concrete strength, durability, appearance, and long-term performance. Skipping or rushing this step can lead to cracking, scaling, surface defects, and reduced service life. If you want concrete that performs for decades instead of years, curing is essential.
What is Concrete Curing?
Concrete curing is the process of maintaining the proper amount moisture and temperature after placement so the cementitious materials (cement, fly ash and slag) can continue hydrating.
Hydration is the chemical reaction that allows concrete to gain strength. If moisture leaves the concrete too quickly, hydration slows or stops before the concrete reaches its full potential including strength, durability and appearance. Think of curing as giving concrete the environment it needs to properly develop.
Why is Concrete Curing Important?
Concrete doesn’t reach its full potential the moment it’s placed. The curing process is what allows it to develop the strength and durability it was designed to achieve. When concrete is properly cured, it continues to hydrate, creating a stronger, denser, and more resilient surface.
The benefits of proper curing can be seen for years to come. Well cured concrete develops higher compressive strength, better resistance to abrasion and wear, lower permeability to water, improved freeze-thaw durability, reduced shrinkage cracking, and ultimately a longer service life. The bottom line is simple, curing is one of the most important factors in determining how well concrete will perform for decades to come.
When Should Concrete Be Cured?
Curing should begin as soon as the concrete is at risk of losing moisture and continue immediately after final finishing. There are two stages of curing.
· Initial/Intermediate Curing: Begins during placement when hot, dry, or windy conditions could cause rapid moisture loss. The concrete surface needs to remain moist prior to finishing operations. To accomplish this, the use of evaporation retarders or fogging have been proven to to help keep the surface moist without working the working the water or evaporation material into the surface.
· Final Curing: Starts immediately after finishing. Wet curing or a membrane-forming curing compound helps retain moisture so the concrete can continue gaining strength. Final curing should be designed to last for a minimum of 7 days.
How is curing done right?Â
A successful curing plan starts when the truck arrives on the project site and the environmental conditions are evaluated. The goal is to be ready to prevent rapid moisture loss, maintain consistent moisture, and protect the concrete from drying winds and temperature extremes.
Whether using evaporation retarders for initial/intermediate curing or water curing methods or a curing compound for final curing, following proper application procedures and manufacturer recommendations is essential. Proper curing is not complicated, but getting the timing right makes all the difference in achieving long lasting concrete performance.
