1, ordinary portland cement concrete curing time shall not be less than 7 days;

2. The curing time of waterproof concrete shall not be less than14d; ;

3. Use pozzolanic silicate cement, slag silicate cement, low-heat micro-expansion cement and slag silicate dam cement (when pouring in large volume): the curing time shall not be less than 2 1 day;

4. Cement mixed with fly ash on site (in mass pouring): the curing time shall not be less than 2 1 day;

5, high temperature wet curing time shall not be less than 28 days (mass casting);

6, others according to the requirements of design specifications.

7. For concrete in general environment (non-severe cold climate), we generally use plastic film (straw bag) for sprinkler maintenance. After concrete pouring, the final setting occurs within 8- 12 hours, and the curing of concrete should start before the final setting of concrete; The purpose of concrete curing is to make concrete exert its strength under the most suitable temperature and humidity conditions (hydration reaction), promote the crystallization of cement, and then increase its cohesive force and concrete's ability to hold steel bars.