Assessment, Based On Reinforcement Corrosion Durability Of Concrete Structures

Along with the rapid development of finance and enhancement of our national power of China, the reinforced concrete structure as well as the high property reinforced concrete structural are used more and more extensive , and there's endurance problem also gets to pay attention more and more. Due to the corronsion of ireinforcements in concrete, the durability of structures declines gradually, which will destroy the carrying capacity and shorten the service life of structures. Therefore, being an research project, after the structures have been used for years, it is a very important task to evaluate the performance of degraded structures in order to predict their residual service life according to the use condition, actual load information and external environment, which needs lucubrate mostly. This paper includes following content mainly:(1) It elaborates the development of the structure durable theory, and points out the durable research of reinforced concrete structure divide into three levels on aspect of the material the component and the structure. For improving and enhancing the concrete structure durable, it is also the main way to take steps from the above three aspects.(2) It analyzes the steel bar corrosion mechanism of the reinforced concrete structure, and points out that the electrochemistry corrosion rate is much quicker than the chemistry corrosion, also is more common, thus its harm is also larger. In the concrete structure, the corrosion of reinforcing bar is the interaction mainly between iron and electrolyte, and moreover, the concrete carbonizes and the chloride ion all corrodes the damage to the reinforced concrete structure. According to the difference corrosion level of reinforcing bar, it make the corresponding measure of prevention and cure of the structures.(3) It researches the durability evaluation of the corrosion reinforced concrete structure The corrosion quantity of the bend and compression member has been calculated by using the rust expansion crack along the steel bar in concrete, and forecasts the component durability. So, the endurance of the reinforced concrete structure can be evaluated with using distribution coefficient to each components' endurance. On the foundation of this theory, it establishes the the bearing capacity model, and according to the calculate data, the curve has been made to show the law between the change of crack width and the durable degree of the beam, the column and the structure.