Computational Technology Resources - CCP

C. Hidalgo Signes¹, P. Martínez Fernández², M.E. Garrido de la Torre¹ and R. Insa Franco²

¹Department of Geotechnical and Geological Engineering, Universidad Politécnica de Valencia, Spain
²Department of Transport Engineering and Infrastructure, Universidad Politécnica de Valencia, Spain

Keywords: railways, scrap tyres, waste tyres, unbound granular material, subballast, bearing capacity, degradation.

Summary

Nowadays scrap tyres pose a significant environmental threat. Reusing them as a raw construction material is one of the most promising alternatives for their disposal. Within this context, the present paper proposes reusing scrap tyres in the form of unbound aggregate-rubber mixtures to be used as a subballast layer. This option offers two potential advantages. On the one hand, it allows the reuse of large quantities of this problematic waste material. On the other hand, in Eastern Spain most aggregates are supplied from quarries located in calcareous formations. These materials usually present a high degree of fragmentation and are not particularly resistant to degradation.

The main objective of the project, described in this paper, is to characterise rubber-aggregate mixtures in order to assess their reliability as a substitute for traditional subballast. Therefore, aggregates from five different quarries located in Eastern Spain have been sampled and tested according to the requirements fixed by the PF-7, including the Los Angeles and Micro-Deval tests as well as permeability tests. Afterwards, mixes were prepared with varying percentages of rubber content, namely 2.5, 5 and 10 percent in terms of weight. These mixes were tested, and the results show that an addition of about 7.5 percent provides a lighter material with enhanced resistance to degradation and fragmentation.

purchase the full-text of this paper (price £22)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £85 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 24 Unbound Granular Materials for Sub-Ballast Layers and their Mixing with Rubber Particles from Scrap Tyres C. Hidalgo Signes¹, P. Martínez Fernández², M.E. Garrido de la Torre¹ and R. Insa Franco² ¹Department of Geotechnical and Geological Engineering, Universidad Politécnica de Valencia, Spain ²Department of Transport Engineering and Infrastructure, Universidad Politécnica de Valencia, Spain doi:10.4203/ccp.110.24 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Unbound Granular Materials for Sub-Ballast Layers and their Mixing with Rubber Particles from Scrap Tyres", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 24, 2016. doi:10.4203/ccp.110.24 Keywords: railways, scrap tyres, waste tyres, unbound granular material, subballast, bearing capacity, degradation. Summary Nowadays scrap tyres pose a significant environmental threat. Reusing them as a raw construction material is one of the most promising alternatives for their disposal. Within this context, the present paper proposes reusing scrap tyres in the form of unbound aggregate-rubber mixtures to be used as a subballast layer. This option offers two potential advantages. On the one hand, it allows the reuse of large quantities of this problematic waste material. On the other hand, in Eastern Spain most aggregates are supplied from quarries located in calcareous formations. These materials usually present a high degree of fragmentation and are not particularly resistant to degradation. The main objective of the project, described in this paper, is to characterise rubber-aggregate mixtures in order to assess their reliability as a substitute for traditional subballast. Therefore, aggregates from five different quarries located in Eastern Spain have been sampled and tested according to the requirements fixed by the PF-7, including the Los Angeles and Micro-Deval tests as well as permeability tests. Afterwards, mixes were prepared with varying percentages of rubber content, namely 2.5, 5 and 10 percent in terms of weight. These mixes were tested, and the results show that an addition of about 7.5 percent provides a lighter material with enhanced resistance to degradation and fragmentation. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions