The curing conditions of standard curing are temperature 18-22 degrees and humidity above 95%. As long as these two conditions are met, it is standard curing. No structure needs at least two groups of test blocks, 7 days and 28 days respectively. If it is high-grade concrete above C40, it will take two groups of 28 days. Maintenance under the same conditions means that the test block and the structure it represents are put together, which is the same as the maintenance environment of the structure. At the same time, at least two groups should be watered and maintained. When the beam and slab are tensioned, the strength of the test block under the same conditions shall prevail. Nature protection is the protection of the site environment, and the specific requirements are not clear. General site only requires standard maintenance and maintenance under the same conditions.