Durability Of R.C. Structures Analysis

The carbonation of concrete is important factor affecting the durability of R. C. structures . Firstly, by analyzing existing models of predicting concrete carbonation and its influencing factors, a practical model of predicting the depth of carbonated concrete is proposed in this thesis, which takes the compressive strength of concrete as the main parameter and considers influence of temperature and moisture of environment, construction factors, stress condition and density of CO2 in the environment, and plenty of spot -data has been used to verify the model; By means of regression analysis of the spot-data, the calculating model of uncarbonated remainder is formulated; Considering the randomness of concrete carbonation, the paper put forward a probability analysis method of concrete carbonation span-life. Secondly, applying the model of predicting carbonated concrete, the model of predicting depth of steel corrosion and the method of using durability estimation, which are established in the thesis, to the Jiang Xin Water Pump Station of Wuhan Iron&Steel Corporation, the paper analyzed its residual carbonation span-life on the basis of its durability investigation, which provides foundations to the decision of its maintenance, strengthening and daily managements.