This part of JT/T 821 specifies the classification, requirements, test methods, inspection rules, marking, packaging and storage of anti-corrosion coatings for concrete bridge structure surfaces in humid conditions. This section is suitable for coating materials when the surface of concrete bridge structures is in a state of ebb and flow or alternating dry and wet conditions. Coatings used on the surface of concrete structures under other similar coating environmental conditions can also be implemented as a reference.