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Civil-Comp Conferences
ISSN 2753-3239
ISSN 2753-3239
CCC: 7
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 18.1
Sustainable Sub-Ballast Composed of Recycled Aggregates from Reclaimed Asphalt Road Pavements
M. Sol-Sánchez, O. Guerrero, A. Guillen, F. Moreno and M.C. Rubio
Engineering School, University of Granada, Spain
Full Bibliographic Reference for this paper
M. Sol-Sánchez, O. Guerrero, A. Guillen, F. Moreno, M.C. Rubio, "Sustainable Sub-Ballast Composed of Recycled Aggregates from Reclaimed Asphalt Road Pavements", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on
Railway Technology: Research, Development and Maintenance",
Civil-Comp Press, Edinburgh, UK,
Online volume: CCC 7, Paper 18.1, 2024, doi:10.4203/ccc.7.18.1
Keywords: sub-ballast, railway infrastructure, sustainability, recycled aggregates, reclaimed asphalt pavement, laboratory tests.
Abstract
The commonly employed granular sub-ballast layer in the construction of modern railway tracks consumes a substantial amount of natural aggregates, which may at times be unavailable due to specific requirements. Hence, there arises an opportunity to adopt recycled aggregates to promote sustainable development. The research, focused on the use of reclaimed asphalt pavement as granular sub-ballast, aligns with prior experiences indicating that the utilization of asphalt material can enhance the performance and durability of the layer. The study involves a laboratory investigation into the influence of various design factors on the mechanical performance of the layer, assessing the impact of reclaimed asphalt pavement characteristics and the compaction procedure. Laboratory results, simulating expected service conditions for these materials in railway tracks, have demonstrated the viability and suitability of using recycled asphalt materials to create more sustainable railway tracks. It is feasible to utilize up to 100% granular sub-ballast from reclaimed asphalt pavement aggregates, improving its mechanical behavior by re-compacting the layer at temperatures above 40°C.
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