Maintenance time of the cushion on the roof of the building
for the incorporation of retarding admixture or impermeable concrete , Not less than 14d;
Concrete watering maintenance time: the use of Portland cement, ordinary Portland cement or slag Portland cement mixed with concrete, not less than 7d;
According to the "concrete structure construction quality acceptance criteria" provides:
Concrete should be poured within 12h after the completion of the concrete to be covered, and moisturizing conservation;
