How should moisture curing be applied to ensure uniform curing?

• A. Dry the surface with heat.
• B. Maintain continuous moisture across the surface and exposed area, using spray, mist, fog, or damp curing covers per spec.
• C. Apply water only during the first hour.
• D. Keep surface unmoistened.

Answer: (B)

Maintaining moisture on the concrete surface throughout the curing period is essential for uniform curing. By keeping continuous moisture across the entire surface and any exposed areas and using approved methods such as spray, mist, fog, or damp curing covers per spec, the cement paste continues to hydrate evenly. This prevents premature drying, reduces the risk of moisture gradients, and promotes consistent strength development.

Drying the surface with heat speeds up moisture loss and causes uneven curing. Watering only during the first hour doesn’t sustain hydration for the full curing period. Keeping the surface unmoistened allows rapid moisture loss and leads to nonuniform curing and potential cracking.