New sustainable materials for ballast, subbalast and form layer in railway infrastructures


  • Miquel Morata Royes COMSA
  • Joan Peset Iribarren COMSA
  • Valentí Fontserè Pujol COMSA



Ballast, subballast, slag


This article presents three innovative and sustainable solutions to improve European railway infrastructures. Firstly, Neoballast is presented, a new solution for ballast that offers greater durability, less environmental impact and a reduction in noise and vibrations, among many other benefits. Secondly, the steel slag aggregates developed in the Gain project for use as railway sub-ballast and subgrade, which offers greater mechanical performance than conventional aggregates while making the most of a waste product from steel production, will be presented. Thirdly, the steel slag aggregates developed in the Birbalas project for use as railway ballast and sub-ballast is presented, for which definitive results are still being gathered, although the preliminary results are very positive.


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Pujol, V.M. (2021). 16. Construction: acoustic insulation in buildings and railway applications. Tire waste and recycling. Academic Press, Elsevier Inc.

Proyecto Neoballast (2021): Balasto de alto rendimiento y larga duración para infraestructuras ferroviarias sostenibles. Technical report.

Proyecto Gain (2016): Árido siderúrgico en capas de asiento ferroviarias. Technical report.

Proyecto Birbalas (2021): Desarrollo de productos de balasto y subbalasto ferroviario a partir de escoria negra de acería de horno de arco eléctrico. Technical report.

Proyecto ASICAP (2013): Proyecto ASICAP caracterización de áridos siderúrgicos para uso en capa de base y subbalasto en plataformas ferroviarias. Technical report.