The Research And Design On The Durability Of Reinforced Concrete Member Under Deicing Salt Environment

In recent years, rain and snow disaster occurred many times, thus causing traffic disruption. In order to restore the traffic.The deicing salt which was made of chloride adopted extensively in the world.But, there are more and more desturction cases induced by the durability of reinforced concrete bridge.Based on the related researches of Chinese and international scientists, the theme of the thesis is the research on the durability of reinforced concrete member under deicing salt environment.And this thesis makes a more deep-going and systemic study of the durability in three directions of material, element and structure.Firstly influence the durability of reinforced concrete factors and mechanisms were analyzed. Through the analysis and assumption, this thesis has eliminated carbonization of concrete and the alkali-aggregate reaction and other factors, only considered corrosion of steel bar concrete freeze-thaw cycles these two factors.Secondly, based on the above analysis and assumption., using the superposition of the corrosion and freeze-thaw cycles condition to simulate the deicing salt environment, based on testing of freeze-thaw cycles beams and comparison with non-freeze-thaw cycles beams in the same corrosion conditions, the degradation of residual loading capacity of reinforced concrete in deicing salt environment were studied.Based on the experimental data, change rebar mass corrosion degree into rebar radius corrosion degree.And then the relationship between the rebar radius corrosion degree and the residual flexural loading capacity of the reinforced concrete member is obtained. In the actual project, so that we can intuitively according to the radius of corrosion rate of steel to estimated residual flexural loading capacity of the reinforced concrete member.Finally, this paper summarize and analysis current codes about durability, Some ideas and suggestions are proposed which could provide the reference for amending the current code of durability.