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High performance bituminous sub-ballast for improving the structural behaviour and durability of railway track substructure

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Abstract

Bituminous sub-ballast is considered as an appropriate solution for increasing the structural performance and durability of railway sub-structure. This is especially prominent due to the continuous development of trains, which are capable of circulating at ever faster speeds and transporting evermore freight. Thus, the base infrastructure for trains must also evolve both structurally and sustainably. In this sense, the use of high modulus asphalt mixtures can increase the bearing capacity of the structure, while with the addition of modified bitumen during manufacture could present a promising potential for the improvement of the structural performance and durability of the infrastructure. Therefore, this study focused on assessing the viability and potential benefits of using a high-performance asphalt mixture, manufactured with a highly rubberized low-penetration bitumen, for sub-ballast in railway tracks. To achieve this aim, the behaviour of the high-performance asphalt mixture was compared to a reference asphalt mixture, manufactured with conventional bitumen, which is typically used as bituminous sub-ballast. A series of standard laboratory tests were carried out for both mixtures, as well as two innovative tests to better assess the main failure modes expected in railway applications. In addition, a cost analysis evaluated the economic impact of the high-performance asphalt mixture in comparison with the conventional solution. Results demonstrated that the proposed mixture presented a higher bearing capacity than the conventional bituminous sub-ballast, while reducing around 50% the permanent deformations and susceptibility to cracking under similar efforts. These results indicate that the layer thickness of the modified mixture could thus be reduced by half, and still offer similar mechanical performance to the conventional mixture. In turn, this would provide a potential economic saving higher than 30%, compared to the conventional standard solution for sub-ballast.

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Acknowledgements

The present study has been conducted within the framework of the HP-RAIL research project (Smart technologies & high-performance materials for the next railway generation, RTC-2017-6510-4), funded by the Ministry of Economy and Competitiveness of Spain, inside the National Plan RETOS COLABORACIÓN 2017, and co-funded by the FEDER founds.

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Authors and Affiliations

  1. Laboratory of Construction Engineering, University of Granada. C/ Severo Ochoa S/N, 18071, Granada, Spain

    Juan Manuel Castillo-Mingorance, Miguel Sol-Sánchez, Fernando Moreno-Navarro & María del Carmen Rubio-Gámez

  2. CEPSA Comercial Petróleo, Carretera Daganzo, M-100, km. 55, 28806, Alcalá de Henares, Madrid, Spain

    Vicente Pérez

Authors
  1. Juan Manuel Castillo-Mingorance
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  2. Miguel Sol-Sánchez
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  3. Fernando Moreno-Navarro
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  4. Vicente Pérez
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  5. María del Carmen Rubio-Gámez
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Correspondence to Miguel Sol-Sánchez.

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Castillo-Mingorance, J.M., Sol-Sánchez, M., Moreno-Navarro, F. et al. High performance bituminous sub-ballast for improving the structural behaviour and durability of railway track substructure. Mater Struct 54, 113 (2021). https://doi.org/10.1617/s11527-021-01677-y

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