Study Of High Performance Concrete Compressive Strength Of 350km/h Passenger-dedicated Lines

The rise of High-speed railway in the world has endowed with new vitality for the transportation way of traditional railway. Because of its high speed, low energy consumption and pollution, as well as safety, reliability, comfortable, and high accuracy, it gets much world attention. Presently, high performance concrete are used widely in high-speed railway bridge projects.Each performance of high performance concrete has close inner link with concrete intensity. At present, the concrete structure design takes compressive strength as the main index about concrete requriement all the same, it is easy to carry on the single axial pressure test in the laboratory, with the enhancement of concrete single axle compressive strength, other each emperimental index will correspongdingly rise approximately or proportionally. In fact, the engineering also already widely takes the concrete single axial compressive strength as the general indicator.The paper unifies different rank high-performance concrete compressive strength characters and strength, working performance, durability requirements of Beijing-Shan-Ghai high-speed passenger dedicate line's bridge structure of the different components, taking strength as the main research aim, various compressive strength testing datum of high performance concrete are obtained by the concrete strength experiment, make use of the corresponding mathematical statistic method to recognize and analyze, induce and summarize, seek for the rule, and draw conclusion with guiding sense and practical value. Evluate high performance concrete compressive strength comprehensively. The detailed work and research is as following:1.The author investigated the Changzhou manufacture beam factory of Beijing-Shanghai high-speed rail passenger line, and had the comprehensive understanding to the operation and working conditions of entire beam factory, during these time, I collected lots of valuable datum.2.Using the orthogonal principle to design mix, the importance order of influence on high performance concrete compressive strength is as following: water-cement ratio, mineral admixture content, cement material gross, water-cement ratio has great influence on compressive strength, but in the different age period, the mineral admixture content and the cement material gross have changed significantly, at the same time, recognize the relevant experiment's samall error and high precision experiments . 3.Degin related mix tatio furtherly, research the single factor to high performance concrete compressive strength's influence trend, analyze the HPC compressive strength testing datum, except the water-cement ratio has decreasing influence on compressive strength, water-cement ratio's influence on other factors is neither increasing nor descreasing, but exist the best quantity.4.Make use of the concrete compressive strength datum collected in Changzhou to analyze strength's control condition during the bridge construction, darw conclusion that the strength condition is stable and separate fluctuation is not big, judge basically that production process and maintence is normal. Taking C50 high performance concrete 28d compressive strength for example, discover that procedure of construction process is deficient, and it possible can't meet the requirement with 0.32 probility.