The first day is very important. If there is too much water loss on the first day, the concrete defects may be difficult to make up later. Individual concrete projects did not pay attention to maintenance on the first day, and began to store water for maintenance on the second day. After the commercial concrete is cured, there are still many cracks on the board. This is because cracks have appeared on the first day, which shows that the first day without curing leads to the formation of relatively thick capillaries, which is difficult to heal.

To ensure that commercial concrete does not lose water during the whole specified curing period; Otherwise, it is not completely maintained. The more fully the commercial concrete is cured, the less defects there are in the concrete. If concrete is not fully cured, commercial concrete will have many defects. However, at present, most construction units start sprinkling water on the second day after pouring, 2-5 times a day, so the maintenance is neither timely nor sufficient, resulting in many cracks.