Stiffness and Damping Ratio of Rubber-Modified Asphalt Mixes: Potential Vibration Attenuation for High-Speed Railway Trackbeds

Abstract

This paper presents the first phase laboratory test results of a research project at the University of Kentucky A number of resonant column tests were conducted to measure the stiffness and damping ratio of rubber-modified asphalt (RMA) samples with different rubber contents and mixed by different methods. The measurements were conducted under a wide range of confining pressures and shear strains to simulate the stress conditions that would be expected in a typical railway foundation. Data from the tests show that RMA has stiffness much higher than compacted soils while providing significantly higher damping ratio than most soils under the same strain level. Therefore, the results from this study indicate that RMA has great potential as a foundation material for high-speed railway trackbeds.

Three-Dimensional Finite Element Simulations of Ground Vibration Generated by High-Speed Trains and Engineering Countermeasures

“…The damping ratios of RMAC and AC used here are obtained from experimental results reported by Zeng et al (2001). For the compacted soil and natural soil, the constitutive relationship used is elastic-plastic with Mohr-Coulomb plasticity.…”

Ground vibration isolation with geofoam barriers: Centrifuge modeling

“…Concrete, bentonite, soil bentonitemixtures are the most common filling materials (Al-Hussaini and Ahmad, 1996). However, other materials such as rubber modified asphalt and EPS have also been used to fill the trench (Zeng et al, 2001;Zhong et al, 2002;Itoh, 2003;Itoh et al, 2005). Massarsch (1991) introduces the concept of the gas cushion barrier using a self hardening cement bentonite.…”

Attenuation of ground vibrations using in-filled wave barriers

“…Several full-scale field and centrifuge tests [2,8,28,4,23,32,34], and numerical studies [5,9,16,18,19] have been conducted to determine the efficiency of the open and in-filled wave barriers in attenuating ground vibrations. Field experiments carried out by Celebi et al, [8] on wave propagation used bentonite, concrete and water filled wave barriers.…”