Recycled materials in railroad substructure: an energy perspective  

作　　者：Buddhima Indraratna Yujie Qi Rakesh Sai Malisetty Sinniah KNavaratnarajah Fatima Mehmood Miriam Tawk 

机构地区：[1]Transport Research Centre,School of Civil and Environmental Engineering,Faculty of Engineering and Information Technology,University of Technology Sydney,Sydney,NSW 2007,Australia [2]Department of Civil Engineering,Faculty of Engineering,University of Peradeniya,Peradeniya,Sri Lanka [3]School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong,NSW 2522,Australia [4]College of Engineering and Technology,American University of the Middle East,Egaila,Kuwait

出　　处：《Railway Engineering Science》2022年第3期304-322,共19页铁道工程科学（英文版）

基　　金：the financial assistance provided by the Australian Research Council (ARC) Linkage Project (LP200200915);ARC Industry Transformation Training Centre for Advanced Rail Track Technologies (ARC-ITTC-Rail: IC170100006)

摘　　要：Given that the current ballasted tracks in Australia may not be able to support faster and significantly heavier freight trains as planned for the future,the imminent need for innovative and sustainable ballasted tracks for transport infrastructure is crucial.Over the past two decades,a number of studies have been conducted by the researchers of Transport Research Centre(TRC)at the University of Technology Sydney(UTS)to investigate the ability of recycled rubber mats,as well as waste tyre cells and granulated rubber to improve the stability of track substructure including ballast and subballast layers.This paper reviews four applications of these novel methods,including using recycled rubber products such as CWRC mixtures(i.e.,mixtures of coal wash(CW)and rubber crumbs(RC))and SEAL mixtures(i.e.,mixtures of steel furnace slag,CW and RC)to replace subballast/capping materials,tyre cells reinforcements for subballast/capping layer and under ballast mats;and investigates the energy dissipation capacity for each application based on smallscale cyclic triaxial tests and large-scale track model tests.It has been found that the inclusion of these rubber products increases the energy dissipation effect of the track,hence reducing the ballast degradation efficiently and increasing the track stability.Moreover,a rheological model is also proposed to investigate the effect of different rubber inclusions on their efficiency to reduce the transient motion of rail track under dynamic loading.The outcomes elucidated in this paper will lead to a better understanding of the performance of ballast tracks upgraded with resilient rubber products,while promoting environmentally sustainable and more affordable ballasted tracks for greater passenger comfort and increased safety.

关 键 词：Ballast degradation Recycled rubber Energy dissipation Laboratory testing Rheological model 

分 类 号：U214[交通运输工程—道路与铁道工程]