Rubber-modified hot-mix asphalt pavement by dry process

Abstract

This paper focuses on tyre rubber-modified hot-mix asphalt for traffic pavements fabricated by dry process. Fine granulated crumbed rubber from discarded tyres was mixed with heat aggregates and after a short delay time, an ordinary bitumen binder was added to the mixture in the plug mill. The research was partially carried out in the laboratory (designing the optimum mixture composition) and on site, constructing an experimental road segment, 2.5 km length, in a secondary traffic road located between Salamanca and Ciudad Rodrigo (Spain). The rubber-modified hot-mix asphalt (RMHMA) was placed on site and compacted after a controlled time of maturation (ageing) of the warm rubber-modified hot-mix asphalt, which promotes a close interaction between the rubber particles and the binder.

Keywords:

• crumb rubber, tyre, road, pavement, dry process, rubber-modified hot-mix asphalt

Acknowledgements

The authors acknowledge to Isabel Saltoweis-Acebedo the revision of the manuscript and her suggestions to improve it.

This project has been partially financed by the Agency for the Development of Castilla and León (Spain).