Given that the current ballasted tracks in Aus-tralia may not be able to support faster and significantly heavier freight trains as planned for the future,the immi-nent 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 small-scale 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 sus-tainable and more affordable ballasted tracks for greater passenger comfort and increased safety.

Buddhima Indraratna;Yujie Qi;Rakesh Sai Malisetty;Sinniah K.Navaratnarajah;Fatima Mehmood;Miriam Tawk

Transport Research Centre,School of Civil and Environmental Engineering,Faculty of Engineering and Information Technology,University of Technology Sydney,Sydney,NSW 2007,Australia;Department of Civil Engineering,Faculty of Engineering,University of Peradeniya,Peradeniya,Sri Lanka;School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong,NSW 2522,Australia;College of Engineering and Technology,American University of the Middle East,Egaila,Kuwait

铁道工程科学（英文）

[1]Buddhima Indraratna;Yujie Qi;Rakesh Sai Malisetty;Sinniah K.Navaratnarajah;Fatima Mehmood;Miriam Tawk-.Recycled materials in railroad substructure:an energy perspective)[J].铁道工程科学（英文）,2022(03):304-322

tralia,immi,subballast,CWRC,crumbs

Recycled,materials,railroad,substructure,energy,perspective,Given,that,current,ballasted,tracks,Aus,may,not,support,faster,significantly,heavier,freight,trains,planned,future,nent,need,innovative,sustainable,transport,infrastructure,crucial,Over,past,two,decades,number,studies,have,been,conducted,by,researchers,Transport,Research,Centre,TRC,University,Technology,Sydney,UTS,recycled,rubber,mats,well,waste,tyre,cells,granulated,improve,stability,including,layers,This,paper,reviews,four,applications,these,novel,methods,using,products,such,mixtures,coal,wash,SEAL,steel,furnace,slag,replace,capping,reinforcements,investigates,dissipation,capacity,each,small,scale,cyclic,triaxial,tests,large,model,It,has,found,increases,effect,hence,reducing,degradation,efficiently,increasing,Moreover,rheological,also,proposed,different,inclusions,their,efficiency,reduce,transient,motion,dynamic,loading,outcomes,elucidated,this,will,lead,better,understanding,performance,upgraded,resilient,while,promoting,environmentally,more,affordable,greater,passenger,comfort,increased,safety

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