What is the purpose of curing blankets?

• A. To retain moisture and insulate the surface during early curing.
• B. To accelerate setting by heat
• C. To color the surface
• D. To increase permeability

Answer: (A)

Curing blankets are used to keep fresh concrete moist and at a steady temperature during the early curing period. By insulating the surface, they slow moisture evaporation and help maintain the heat needed for proper hydration, which supports strength development and reduces plastic shrinkage cracking, especially in cold or windy conditions. They are not intended to color the surface or to accelerate setting by applying heat, and they do not increase permeability; in fact, proper moisture retention during curing helps improve the concrete’s durability over time.