Study Of High Performance Concrete Durability Of 350km/h Passenger Dedicated Line

Passenger dedicated Line is high-speed railway which aimes at transporting passengers, taking high speed and rapidity as technical support. It reqiures that the running speed is 200～350km/h. Comparing with the traditional railway, passenger dedicated Line with 350km/h speed has high requirements in bridge structures, ratio of reinforcement, main bodystructure material quality, to satisfy the request of passenger dedicated line's normal service life. The evaluation of high performance concrete's durability has extremely vital significance for bridge structure's durability design and the normal usage capacity.The article unifies the box girder, the pile foundation, pile cap's character and the request of strength, the work-performance, durability of Beijing-Shanghai high-speed railroad passenger dedicated line. Taking the durability as the main research aim, the high performance concrete's each kind of tentative datum are obtained by the conctete fast freezing and thawing test, the electric flux experiment, the infiltration test and corrosion resistance experiment.,then recognize and analyze, at the same time induce and summarize, at last, seek for the rules and draw conclusion. Finally evaluate the high performance concrete durability. The concrete research is as following:1. Investigate the Changzhou manufacture beam factory of Beijing-Shanghai high-speed passenger dedicated line, and collect datum of HPC mix, electric flux, corrosion resistance coefficient and so on. Design concrete mix and make use of Changzhou beam factory's raw materials to make HPC testing sample. Carry on the infiltration test and electric flux experiment to get experimental datum.2. Linear fitting the electric flux experimental datum, obtain the linear correlation coefficient, draw up the relational graph between water cement ratio, cement material gross, mineral content, fly ash content, water reducer content and HPC electric flux, protract the electric flux histogram, analyze influential rules of various mix factors to the HPC anti-chloride ion permeability, as well as carry on the mechanism analysis, draw conclusion.3. Take advantage of the mathematical method of linear regression analysis,, establish the mathematical relational expression between each HPC mix parameters and electric flux, distinguish whether the established empirical formula is effective, and carry on mix parameters forcasting and controling by using obtained empirical formula. 4. Analyze the HPC frost resistance tentative datum, draw up the HPC relative dynamic modulus of elasticity and quality loss rate histogram after 200 fast freezing and thawing in turn. Evaluate the passenger dedicated line HPC's frost resistance.5. Analyze the HPC corossion resistance coefficient, draw up the influence curve between water cement ratio, cement materials gross, fly ash content, mineral powder and HPC corossion resistance coefficient, analyze various influence principle of mix parameter to HPC's sulphate-corrosion resistance, and carry on the mechanism analysis.6. Evaluate comprehensively the durability of high performance concrete of 350km/h passenger dedicated line.