Study On The Chloride Permeability Of Carbonated Concrete

Reinforced concrete structures often because of lack of durability can not designlife, carbonation and chloride ion permeability of concrete structures that affect thedurability of the two main factors. At present, the large number of marine engineeringbuilding, concrete structures in coastal regions the number of rapid growth, and thematerial properties of concrete are faced with grim challenges of the marineenvironment. The chloride ions in sea water intrusion of concrete, steel corrosion caused,significantly reduce the structure of working life, and may in the short term against theuse of structural safety. The pilot of the carbonation of concrete and chloride content,analysis, the carbonation of concrete and infiltration of chloride ion, and further study,the durability of concrete and life prediction method. The results showed that:carbonation of the durability of concrete structures has little effect. chloride infiltrationfrom steel corrosion was affecting the main reason for the durability of concretestructures. Chloride ion concentration gradient through the main diffusion into theconcrete house.Note on the impermeability of concrete, mainly on the impact of concreteimpermeability of the various aspects and the main factors, and response to these factors,domestic and international study on the current status and access to some importantconclusions for the future impermeability of concrete research. The direction ofdevelopment also was discussed.Underwater concrete, chloride ions into the concrete usually have two ways: first isthe "incorporation", such as the incorporation of additives containing chloride, the useof sea sand, construction of water chlorine salt and stir in salt environment, pouringconcrete, The second is the "infiltration", chloride in the environment usually throughthe concrete macro-and micro-defects, and infiltration to achieve in the reinforcedconcrete surface, directly or indirectly undermine the package of concrete andreinforced passive role in the high alkalinity two barriers. Then the occurrence of rustcorrosion product volume expansion, the protective layer of concrete cracking andfalling in the marine environment in the underwater concrete structures are mostly thesituation.