StartR+D+iProjects completed


Current regulations governing the analysis of textile content in ELT powder are insufficient and somewhat sensitive to the subjective impressions of the analyst. The aim of this project was to study the validity of current testing methods.

The project was carried out in cooperation with the University School for Road, Canal and Port Engineering (Madrid Polytechnical University).

The projet design took into account the variables associated with the test, namely, duration, sample size, textile content, etc.

The results obtained indicate that current testing methods only recover a maximum of 41% of textile fibres in samples. Accordingly, the conclusion reached is that the test method is not appropriate for quantifying the textile content of tyre powder.

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This project, funded by the Ministry for Economic Development and including as participants Acciona Infraestructuras, University of Cantabria, Krypton Chemical and SIGNUS, was designed to develop a Spanish system which was trialled exprerimentally in Granada's light railway.

Balastless track systems are an alternative to the traditional ballast-based systems and offer the advantage of being maintenance-free as well as substantially mitigating the vibrations and noise caused by passing trains.


In 2010 SIGNUS carried out a research project funded by the Ministry of the Environment to evaluate the modification of the properties of mass reinforced concrete obtained using ELT materials, in some cases by substituting the coarse aggregates and in others by adding materials obtained from tyre shredding and granulation.

Numerous properties in different concrete formulations were evaluated. In some of the properties the values proved to be lower but in others improvements were seen.

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This project was supported by the Centre for Industrial Technology Development (CDTI) and was carried out in cooperation with CEMOSA, LABIKER and SACYR VALLEHERMOSO. The Geotechnics Laboratory of CEDEX was also used.

The project consisted of the construction of an embankment made from shredded tyres. Different sections were built to test the behaviour of the various configurations of the materials. Prior to this, an experimental phase consisted of a laboratory-scale reproduction of the behaviour of the materials under load and effort conditions simulating the real conditions.

From Day 1 of construction, the embankment was monitored using pressure and temperature sensors, together with sensors for measuring vertical and horizontal movement. The tests conducted showed that this type of application is perfectly safe from the construction perspective and also in environmental terms. No adverse effects were found in the surrounding area, according to laboratory verifications based on the results of the leachates produced by water contact with the end of life tyres.

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