In cold weather curing, which statement is correct?

• A. Not maintaining moisture helps prevent cracking.
• B. Maintaining moisture and temperature during early curing.
• C. Curing dry with heat only.
• D. Cooling the concrete to below ambient.

Answer: (B)

In cold weather curing, the key idea is that keeping the concrete moist while also maintaining a suitable temperature during the early curing period is essential for proper hydration and to prevent cracking. When moisture is kept, evaporation slows, plastic shrinkage is minimized, and hydration can continue, allowing the concrete to develop its strength. At the same time, maintaining adequate temperature prevents the pore water from freezing, which would cause cracking and long-term strength loss.

That’s why the best approach is to ensure both moisture and warmth during early curing. Letting moisture escape or relying on heat alone dries out the surface and can still lead to cracking and weaker concrete, while cooling below ambient can slow or halt hydration and may cause freezing damage. In practice, use moisture-retaining coverings, curing compounds, or wet methods, and apply insulation or gentle heat as needed to keep the surface and surrounding environment within the appropriate temperature range.