Study On Methods Of Chloride Concentration Distributing Prediction Of Concrete

The durability of reinforced concrete structure has been widespread in recent decades is a matter of concern, especially chloride ion erosion under the durability of concrete structures. From an engineering examples and experimental study of people realize that concrete structures in this environment will be under the conditions of physical and chemical erosion of the strong role, then the steel corrosion, bursting of concrete , the durability of the structure of a serious shortage.Concrete Durability refers to the design requirements of the objectives of the use of the period, funds do not need to spend a lot of reinforcement and to maintain its security, functionality and appearance requirements; can be defined as structures in the chemical, biological or other unfavorable factors The role, within the scheduled time, the material will not lead to the deterioration of the structure unacceptable failure probability, or that the objective requirements of the structure in use during the period, funds do not need to spend a lot of reinforcement and to ensure their safety and Usefulness of capacity.Life is that structural members in the construction or completion of the production made after the scheduled maintenance and use conditions, the performance can meet all the requirements of the scheduled period.At present, the chloride ion erosion of the reinforced concrete corrosion damage is civil engineering and engineering academia one of the issues of concern. As the chloride ion in the reinforced concrete erosion caused by corrosion, the structure of the durability of gradual decline, endangering the structure of the bearing capacity, reduce the life expectancy of the structure. Therefore, the understanding of chloride in the concrete in the transmission mechanism, to predict with reasonable accuracy in concrete chloride ion concentration distribution is required in-depth study of the important subject. Chloride environment against forecasts of reinforced concrete in various locations chloride ion concentration of research in the shortcomings of the paper from the numerical simulation and theoretical research on two aspects of chloride in the concrete of the concentration distribution were studied. Mainly include the following:1,Of the chloride in the concrete in the transmission mechanism, the analysis of the impact of various factors, reinforced concrete structure for durable life lay the foundation for forecasting and assessment. More than a single factor has a lot of qualitative research, but quantitative research to be further carried out, and multi-factor under study at the same time there are also fresh reports. Chloride, and other research material in concrete in the transmission mechanism, and related factors model, not only to improve and perfect the transmission of concrete, accurate and objective evaluation of saturated and unsaturated porous medium of transmission performance of great significance, but also for the establishment of environment-related Concrete life prediction model, developed as-built concrete structure maintenance strategy and enhance in-service life of concrete structures is important theoretical and practical significance.2,The study reinforced existing circumstances, the special-shaped cross-section of concrete in the chloride concentration of the forecasting methods. ANSYS software based on the thermal analysis module, through the parameters of equivalent treatment, a concrete realization of chloride ion concentration in the distribution of two-dimensional numerical simulation, with the proliferation based on Fick's second law of the equation analytical solution, proven effective methods of simulation Sexual. And special-shaped cross-section of concrete in the chloride ion concentration distribution of the forecast, the forecast results were analyzed. Consider the reinforced steel bars and not consider the impact, cross-section of the reinforced surface location of the chloride concentration of a significant difference, consider the reinforced steel bars when most of the region near the surface of chloride ion concentration was significantly higher than that of reinforced not consider the situation and a reinforced presence When reinforced around chloride to speed the erosion was significantly lower than non-reinforced, the other depth of chloride corrosion rate without significant changes. There are special-shaped cross-section of reinforced presence hindered the chloride ion transmission, and chloride ion at the surface of reinforced steel bars at the time no longer than that. The points along the Line of chloride ion concentration in the direction of the protection layer to the direction of chloride ion concentration, through the special-shaped cross-section of the concrete components of the proliferation of two-dimensional simulation predicted that effective to fill the existing gaps in theory, for the future of reinforced concrete in the chloride ion concentration distribution The proliferation of two-dimensional theory provided an effective basis.3,For freezing-thawing damage to the concrete chloride performance of the proliferation, through consideration of freezing-thawing damage factor on the impact of diffusion coefficient, the model has been amended and then come to a concrete chloride in the proliferation of multi-factor forecast model. The theoretical model said after the results of a comparison with the test results, good agreement with the test results to verify the validity of the model.