Railway sleepers, while made by significantly stronger concrete than in conventional construction, often end up crushed for steel recovery, leaving large amounts of concrete fragments underutilised and discarded in landfills. This study explores the feasibility of incorporating sleeper recycled aggregate concrete (SRAC) into railway ballast, offering a sustainable solution for reusing 2–5 million tonnes of discarded sleepers annually. The research involves extensive laboratory testing, including Los Angeles and Micro-Deval abrasion tests, water absorption assessments, and mechanical evaluations using point load and ballast box tests. The ballast box tests subjected samples to 100,000 loading cycles to analyze settlement, ballast breakage, stiffness, and damping ratio. Results indicate that a mixture of 25% SRAC and 75% stone ballast provides an optimal balance of performance and durability for railway lines. For this mixture, the ballast box tests showed a settlement of 9.8 mm, a ballast breakage index of 0.0661, and a stiffness of 88,096 N/mm, all within acceptable ranges for railway ballast applications. The study also highlights the significant economic and environmental benefits of adopting SRAC in ballast applications, supporting sustainable railway infrastructure development.
EsmaeiliMAskariA. Laboratory investigation of the cyclic behavior of rock ballast mixed with slag ballast for use in railway tracks. Constr Build Mater2023; 365: 130136. https://doi.org/10.1016/j.conbuildmat.2022.130136
3.
KaewunruenSFuHYeC. Numerical studies to evaluate crack propagation behaviour of prestressed concrete railway sleepers. Eng Fail Anal2022; 131: 105888. https://doi.org/10.1016/j.engfailanal.2021.105888
MageeG. Smoking out the true causes of tie failures. Ry Track Struct1950; 6(2): 130–132.
6.
PalomoÁFernández-JiménezALópez HombradosC, et al.Railway sleepers made of alkali activated fly ash concrete. Rev Ing Constr2007; 22(2): 75–80. https://doi.org/10.4067/s0718-50732007000200001
7.
XianmaiCYiDBoboY, et al.Numerical simulation analysis of sleeper damage under dynamic load based on discrete element method. Eng Fail Anal2024; 163: 108506. https://doi.org/10.1016/j.engfailanal.2024.108506
8.
MilfordRLAllwoodJM. Assessing the CO2 impact of current and future rail track in the UK. Transp Res D: Transp Environ2010; 15: 61–72. https://doi.org/10.1016/j.trd.2009.09.003
9.
PonsJJSanchisIVFrancoRI, et al.Life cycle assessment of a railway tracks substructures: comparison of ballast and ballastless rail tracks. EIA Review2020; 85: 106444.
JingGWangJWangH, et al.Numerical investigation of the behavior of stone ballast mixed by steel slag in ballasted railway track. Constr Build Mater2020; 262: 120015. https://doi.org/10.1016/j.conbuildmat.2020.120015
12.
BayraktarOYTurhalSBenliA, et al.Application of recycled aggregates and biomass ash in fibre-reinforced green roller compacted concrete pavement-technical and environmental assessment. Int J Pavement Eng2025; 26: 2458140. https://doi.org/10.1080/10298436.2025.2458140
13.
BayraktarOYKaplanGBenliA. The effect of recycled fine aggregates treated as washed, less washed and unwashed on the mechanical and durability characteristics of concrete under MgSO4 and freeze-thaw cycles. J Build Eng2022; 48: 103924. https://doi.org/10.1016/j.jobe.2021.103924
14.
BenliABayraktarOYKoksalF, et al.Sustainable use of recycled fine aggregates in steel fiber-reinforced concrete: fresh, flexural, mechanical and durability characteristics. J Build Eng2024; 97: 110745. https://doi.org/10.1016/j.jobe.2024.110745
15.
KılıçDÖzABenliA, et al.Integration of reclaimed asphalt aggregates into glass fiber-reinforced alkali-activated composites: mechanical performance and durability. Constr Build Mater2025; 458: 139645. https://doi.org/10.1016/j.conbuildmat.2024.139645
16.
BayrakBBenliAAlcanHG, et al.Recycling of waste marble powder and waste colemanite in ternary-blended green geopolymer composites: mechanical, durability and microstructural properties. J Build Eng2023; 73: 106661. https://doi.org/10.1016/j.jobe.2023.106661
17.
AREMA. AREMA manual for railway engineering. Ballast Gradations, 2010.
18.
ASTM. ASTM C136-06, standard test method for sieve analysis of fine and coarse aggregares. ASTM International, 2014.
19.
ASTM. ASTM-535, standard test method for resistance to degradation of large-size coarse aggregate by abrasion and impact in the Los Angeles machine. ASTM International, 2009.
20.
British Standards Institution. B. E. 1097-1, tests for mechanical and physical properties of aggregates. Determination of the resistance to wear (micro-deval). British Standard Institution, 2011.
21.
ASTM. ASTM D5731. Standard test method for determination of the point load strength index of rock and application to rock strength classifcation. ASTM International, 2016.
22.
HiramatsuYOkaY. Determination of the tensile strength of rock by a compression test of an irregular test piece. Int J rock Mech Min Sci & Geomech Abstr1966; 3(2): 89–90.
23.
KoohmishiMPalassiM. Evaluation of the strength of railway ballast using point load test for various size fractions and particle shapes. Rock Mech Rock Eng2016; 49: 2655–2664. https://doi.org/10.1007/s00603-016-0914-3
24.
KoohmishiM. Assessment of strength of individual ballast aggregate by conducting point load test and establishment of classification method. Int J Rock Mech Min Sci2021; 141: 104711. https://doi.org/10.1016/j.ijrmms.2021.104711
25.
Hossein EsfahaniMEsmaeiliMTadayonM. The effects of admixtures on the mechanical behavior of preplaced ballast concrete for use in slab track systems. Int J Pavement Res Technol2021; 16: 1–27. https://doi.org/10.1007/s42947-021-00117-y
LimWL. Mechanics of railway ballast behaviour. University of Nottingham, 2004.
28.
IndraratnaBNimbalkarSChristieD, et al.Field assessment of the performance of a ballasted rail track with and without geosynthetics. J Geotech Geoenviron Eng2010; 136: 907–917. https://doi.org/10.1061/(asce)gt.1943-5606.0000312
29.
EsmaeiliMAelaPHosseiniA. Experimental assessment of cyclic behavior of sand-fouled ballast mixed with tire derived aggregates. Soil Dynam Earthq Eng2017; 98: 1–11. https://doi.org/10.1016/j.soildyn.2017.03.033
30.
EsmaeiliMShamohammadiAFarsiS. Effect of deconstructed tire under sleeper pad on railway ballast degradation under cyclic loading. Soil Dynam Earthq Eng2020; 136: 106265. https://doi.org/10.1016/j.soildyn.2020.106265
31.
SadeghiJBaratiP. Evaluation of conventional methods in analysis and design of railway track system. Int J Civ Eng2010; 8: 44–56.
32.
IndraratnaBHussainiSKKVinodJ. The lateral displacement response of geogrid-reinforced ballast under cyclic loading. Geotext Geomembranes2013; 39: 20–29. https://doi.org/10.1016/j.geotexmem.2013.07.007
33.
ASTM. ASTM C127, standard test method for density, relative density (specific gravity), and absorption of coarse aggregate, C127-12. ASTM International, 2012.
34.
ASTM. ASTM C29M-97, standard test method for bulk density (unit weight) and voids in aggregate. ASTM International, 2003.
35.
ShiCFanZConnollyDP, et al.Railway ballast performance: recent advances in the understanding of geometry, distribution and degradation. Transp Geotechn2023; 41: 101042. https://doi.org/10.1016/j.trgeo.2023.101042
SeligETWatersJM. Track geotechnology and substructure management. Thomas Telford, 1994.
39.
JeonS-S. Settlement and bearing capacity of roadbed subjected to tilting-train loading in various ground conditions. Int J Railway2015; 8: 35–41. https://doi.org/10.7782/ijr.2015.8.2.035
40.
LeeKLFarhoomandI. Compressibility and crushing of granular soil in anisotropic triaxial compression. Can Geotech J1967; 4: 68–86. https://doi.org/10.1139/t67-012
IndraratnaBSalimW. Mechanics of ballasted rail tracks: a geotechnical perspective. CRC Press, 2005.
44.
IndraratnaBLackenbyJChristieD. Effect of confining pressure on the degradation of ballast under cyclic loading. Geotechnique2005; 55: 325–328. https://doi.org/10.1680/geot.2005.55.4.325
45.
JacobsenLS. Steady forced vibration as influenced by damping: an approximate solution of the steady forced vibration of a system of one degree of freedom under the influence of various types of damping. Trans ASME1930; 52: 169–178. https://doi.org/10.1115/1.4057368
46.
KennedyJ. A full-scale laboratory investigation into railway track substructure performance and ballast reinforcement. Heriot-Watt University, 2011.
47.
TajabadipourMEsmaeiliMAskariA. Experimental evaluation of cyclic performance of steel slag and grids of truck scrap tire as a novel reinforced ballast material. Constr Build Mater2024; 411: 134472. https://doi.org/10.1016/j.conbuildmat.2023.134472
48.
MehranKSMortazavi BakHMahdiAS, et al.Experimental investigation of the cyclic behavior of steel-slag ballast mixed with tire-derived aggregate. J Mater Civ Eng2021; 33: 04020468. https://doi.org/10.1061/(asce)mt.1943-5533.0003586
49.
SadeghiJToloukianAZareiMA, et al.Improvement of ballast behavior by inclusion of tire-derived aggregates with optimum size. Constr Build Mater2025; 458: 139530. https://doi.org/10.1016/j.conbuildmat.2024.139530
SañudoRGoswamiRRRicciS, et al.Efficient reuse of railway track waste materials. Sustainability2022; 14: 11721. https://doi.org/10.3390/su141811721
52.
JoãoPJorgeDBMarcoLT. Use of recycled aggregates in concrete: opportunities for upscaling in Europe. Publications Office of the European Union, 2023.
53.
HarrisonJRGhorbaniR. Behnam review of crushed recycled concrete and recycled ballast potential in rail applications. Western Australian Road Research and Innovation Program, 2023, p. 70.
