Curing requirements for concrete

Curing methods for concrete:

(1) Natural Maintenance (commonly used on-site construction): Covered watering maintenance, film cloth maintenance, etc.

(2) Heat Treatment and Maintenance

2. Start of Natural Curing Time: Before final setting (usually 8-12 hours after pouring)

3. Concrete curing time requirements:

(1) Ordinary Portland Cement, Portland Cement-Silicate, Blast-furnace Slag Portland Cement (heat-resistant, steam-cured): 7d

(2) Concrete mixed with volcanic ash (fly ash) silicate cement: 14d

(3) Concrete mixed with retardants, mineral admixtures, or with requirements for impermeability: 14d

(4) Concrete with waterproofing (indoor, underground, seasonal, roof waterproofing) and impermeability requirements: 14d

(5) Large Volume Concrete: 14d

Post-tensioned concrete: 14d

(7) Waterproof required post-cast concrete: 28d