Concrete durability refers to the concrete in actual use conditions to resist the role of various destruction factors, long-term ability to maintain strength and appearance integrity concrete durability refers to the structure in the specified service life, under the action of various environmental conditions, In short, durability indicators of concrete materials generally include: Carbonization of concrete Corrosion of steel bars in concrete 3 base - aggregate reaction Freezing and thawing damage of concrete Chloride ion erosion Durability test Items 1. Electric flux: the electric flux through concrete is used to reflect the chloride ion penetration resistance of concrete; 2, concrete anti-freezing label: with slow freezing method measured by the maximum number of freezing-thawing cycle to divide the concrete anti-freezing performance grade; 3, concrete frost resistance grade: with fast freezing method measured by the maximum number of freeze-thaw cycles to divide the concrete frost resistance grade; 4. Sulfate resistance grade: concrete sulfate resistance grade measured by the maximum number of dry and wet cycles 5. Rapid chloride ion migration coefficient method: the test method of chloride ion migration coefficient to reflect the chloride ion penetration resistance of concrete by measuring the chloride ion penetration depth in concrete -- referred to as RCM method; 6, early crack resistance test: used to test the early crack resistance performance of concrete specimens under constraints; 7, water penetration resistance test: (1) Seepage height method: used to measure the average seepage height of concrete under constant water pressure to express the concrete water permeability resistance; (2) step by step pressure method: used to apply water pressure step by step to determine the impermeable level of concrete performance. 8. Wear resistance 9, reinforcement 10. Alkali aggregate reaction