Curing compounds should not be used on exterior concrete placed during the fall in cold-winter areas because they may not wear off in time to let the concrete dry.

Curing compounds should not be used on exterior concrete placed during the fall in cold-winter areas because they may not wear off in time to let the concrete dry.

• A. True
• B. False
• C. Only in warm climates
• D. Depends on concrete mix

Answer: (A)

The main idea is how a surface-curing film affects moisture loss. Curing compounds form a film on the concrete surface to hold moisture in during early curing, which promotes proper cement hydration. But that same film also slows or prevents the surface from drying out. In fall conditions in cold-winter areas, you often need the surface to dry before freezing temps arrive and before finishing operations, so a curing compound that may not wear off quickly in the cold can trap moisture and prevent timely drying. If the surface stays wet or moist for too long, it increases the risk of freeze-thaw damage and delays finishing. For exterior pours in cold weather, relying on curing compounds that linger isn’t desirable, hence the recommendation is to avoid them in this scenario.

The main idea is how a surface-curing film affects moisture loss. Curing compounds form a film on the concrete surface to hold moisture in during early curing, which promotes proper cement hydration. But that same film also slows or prevents the surface from drying out. In fall conditions in cold-winter areas, you often need the surface to dry before freezing temps arrive and before finishing operations, so a curing compound that may not wear off quickly in the cold can trap moisture and prevent timely drying. If the surface stays wet or moist for too long, it increases the risk of freeze-thaw damage and delays finishing. For exterior pours in cold weather, relying on curing compounds that linger isn’t desirable, hence the recommendation is to avoid them in this scenario.