NASCLA Accredited Commercial General ContractorConcreteEasy
A concrete contractor is preparing to pour a large structural slab for a commercial building. To ensure proper hydration and strength development, which of the following curing methods would be most effective for minimizing moisture loss in a hot, dry climate?
- AUsing steam curing immediately after finishing.
- BApplying a liquid membrane-forming curing compound.
- CCovering the slab with burlap that is allowed to dry out.
- DIntermittent sprinkling with water during the day.
Show answer & explanationAnswer & explanation
Correct answer: B. Applying a liquid membrane-forming curing compound.
Applying a liquid membrane-forming curing compound creates a barrier on the concrete surface that prevents the evaporation of moisture, making it highly effective in hot, dry climates for continuous hydration.
Why the other options are wrong
- A. Steam curing is typically used for precast concrete elements to accelerate strength gain and is not a standard or practical method for large structural slabs in the field for moisture retention.
- C. Burlap allowed to dry out will absorb moisture from the concrete, providing little to no curing benefit and potentially causing more harm.
- D. Intermittent sprinkling can lead to cycles of wetting and drying, which may cause surface cracking and is less effective than continuous moisture retention.
Liquid Membrane Curing
A curing method involving the application of a liquid compound to the concrete surface to form a moisture-retaining film.
- Forms a physical barrier against evaporation.
- Commonly used when continuous water curing is impractical.
- Must be applied evenly and at the correct coverage rate.
Memory trick: Hydrate Hard, Seal Smart, Steam Strong, Water Wise.