Final answer:
Concrete should be kept moist for at least 7 days to ensure proper curing and strength development when the finished floor is exposed concrete.
Step-by-step explanation:
When the finished floor is exposed concrete, it is important to keep the concrete moist for a certain period of time. Generally, concrete should be kept moist for at least 7 days to ensure proper curing and strength development. This is to prevent the concrete from drying out too quickly, which can lead to shrinkage cracks and reduced strength.
Moisture can be maintained by covering the concrete with wet burlap, plastic sheets, or by continuously spraying it with water. It is also important to avoid exposing the concrete to direct sunlight and hot temperatures, as this can cause premature drying.
By keeping the concrete moist for the recommended duration, you can ensure a strong and durable finished floor.