1, ordinary frame bridge adopts ordinary concrete protective layer, and the curing period is generally more than 7 days. During this period, it is necessary to take appropriate maintenance measures, such as keeping moist and avoiding the influence of environment and external forces with large temperature changes.

2. Adopt high-performance concrete (such as high-strength concrete and high-performance self-compacting concrete). As the material of the protective layer of frame bridge, the curing period may be longer, usually 14 days or longer, and it takes longer for high performance concrete to reach the design strength and performance.