Cure Concrete Flatwork

Why Cure Concrete Flatwork?

• Helps concrete gain strength.
• Helps reduce shrinkage of concrete thus preventing surface cracking.
• Increases surface hardness, helping to reduce abrasion damage.
• Makes the concrete more watertight.
• Helps resist freeze-thaw damage and damage from deicers.

All concrete should be cured. Studies have shown that without proper curing, concrete may lose up to 50% of its strength.

Concrete gains strength and durability through a chemical reaction known as hydration. Hydration is when the cement in concrete and water chemically react to form a hardened paste. For proper hydration to occur the concrete must be kept moist and above 55 degrees for approximately one week.
In cooler temperatures, insulating blankets should be used to keep the temperature of the concrete above 55 degrees. In cold conditions, supplemental heat provided through properly vented heaters or ground heaters may be necessary.

---

​

​How to Cure: Typical concrete has enough moisture in it to achieve proper hydration if curing is begun within an hour after final finishing or after the visible water sheen is gone. The concrete must be kept continually warm and moist until adequate strength is achieved.

Wet Curing: Concrete can be cured by placing burlap, cotton mats, or curing mats that are kept continually moist. In addition, the concrete could be kept continually moist by ponding water or continuously sprinkling with water on the concrete surface. Note: Wet curing methods should be used if the local sand aggregate is known to produce popouts.

​Plastic Sheets: Plastic sheets can be used to retain moisture in the concrete; however, if the sheet is not kept completely flat, surface discoloration may occur.

Waterproof Paper: Waterproof paper can be used similar to plastic sheets; however, they will not mar the concrete surface.

Liquid Membrane-Forming Curing Compounds: Commercially available curing compounds applied by spraying or rolling on are a common form of curing. The compounds normally are applied at a rate of 150 to 200 sq ft per gallon; however, products may vary, so manufacturer’s recommendation should be followed.

Upcoming Events