Curing requirements for concrete

Curing methods for concrete:

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

(2) Heat Treatment and Maintenance

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

3. Concrete curing time requirements:

(1) Ordinary Portland Cement, Portland cement-silicate, slag Portland cement (heat-resistant, steam-cured): 7d

Volcanic ash (fly ash) slag cement concrete: 14d

(3) Concrete blended with retarding admixtures, mineral admixtures, or with requirements for impermeability: 14d

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

(5) Large volume concrete: 14d

(6) Post-tensioned concrete: 14d

(7) Waterproofing required for post-cast concrete: 28d