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Testing Research of Waterproof Asphalt Material on the Ballastless Track Subgrade

Author: PanChengZuo
Tutor: QiuYanJun
School: Southwest Jiaotong University
Course: Road and Railway Engineering
Keywords: Waterproof asphalt mixture Core indicators Optimization index Indicators of raw materials Aggregate gradation Mix Proportion Design Seepage Test
CLC: U214
Type: Master's thesis
Year: 2008
Downloads: 94
Quote: 0
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Abstract


High-speed rail due to run fast and stable , in our country is more widely used . But requires a solid and stable foundation for high-speed operation of the train , which also requires the roadbed must have sufficient strength and stiffness . Geomaterials as roadbed construction the main , in the dry state to provide adequate bearing capacity , but in water erosion soften , gradually loses its strength and stability . This requires laying a waterproof layer on the subgrade surface to prevent infiltration of rainfall, snowmelt and surface runoff and soften the roadbed . Functional requirements as well as road subgrade waterproof layer of bituminous mixtures , hydraulic asphalt mixture properties analysis of the characteristics of the study to determine the waterproof asphalt mixture should have five properties : permeability , dense , water stability , low temperature crack resistance and high temperature stability, as well as indicators of the corresponding parameter testing methods. At the same time , a clear primary and secondary relationship between these five properties . Secondly, according to the nature of the characteristics of waterproof asphalt mixture to determine the raw materials, test items , and metrics . In the consolidated cf the AC - 5 , AC - 10 and AC - 13 three kinds of asphalt mix design gradation curve near the ceiling in value and the lower limit of nine design gradation curve in the nature of the five indicators to determine a waterproof asphalt mixture gradation type for Sami - 10 . And formed a limit on the coefficient of permeability and porosity , freeze-thaw splitting strength ratio and Marshall stability in order to optimize factor , low temperature coefficient of linear shrinkage test indoor Mix Design Method . Finally, analyze and summarize the key steps in the testing process to determine the different test methods for measuring asphalt mixture permeability coefficient and the respective operating points .

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