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http://dx.doi.org/10.7782/JKSR.2014.17.2.114

Application of a Simple Non Destructive Test Method to Obtain the Dynamic Modulus of Asphalt Mixtures used for an Asphalt Trackbed Foundation  

Lim, Yujin (Department of Civil and Railroad Engineering Paichai University)
Lee, SeongHyeok (Korea Railroad Research Institute)
Lee, JinWook (Korea Railroad Research Institute)
Lee, ByeongSik (Formerly Paichai University, Sedam E&C)
Publication Information
Journal of the Korean Society for Railway / v.17, no.2, 2014 , pp. 114-122 More about this Journal
Abstract
An asphalt trackbed is to be adapted in Korea to provide better bearing capacity and stability to the track and a comfortable ride to passengers. The dynamic modulus of Hot Mixed Asphalt(HMA) mixes is a critical design input parameter to determine the thickness of the asphalt trackbed. In this study, impact resonant tests and ultrasonic test methods are designed to obtain the dynamic modulus. These test methods are also verified to check the etffectiveness of constructing a master curve of the dynamic modulus over a wide range of frequencies and temperatures. The test results are compared to the computed dynamic modulus using AASHTO 2002 and the KPRP's proposed model. It can be concluded that the proposed simple test methods are effective to obtain the dynamic moduli of the asphalt mixes for the design of an asphalt trackbed foundation.
Keywords
Asphalt Trackbed; Dynamic Modulus; Impact Resonant Test; Ultrasonic test;
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