Techniques for reduced-temperature asphalt production and their impact on asphalt performance

A highy topical subject in the contribution of road construction to sustainable development is the production of asphalt mixtures at lower temperatures (reduced-temperature asphalt, RTA), because of the advantages from the energy, environmental and engineering points of view. Within a project on European test methods for bituminous mixtures and binders that was initiated by the Belgian Bureau for Standardization (NBN) and aims among other things at improvements with a view to sustainable development, BRRC has undertaken to closely monitor the recent developments and achievements in the field of RTA, both in Belgium and abroad. This includes the following aspects:

  • monitoring of the development and applications (e.g. test sections) of new production techniques such as the use of organic and chemical additieves and of foaming techniques;
  • impact of production at lower temperatures on the performance characteristics and the (long-term) durability of the asphalt mixture;
  • proposals for possible adaptations to European product standards and test methods to account for production at lower temperatures (e.g. short-term ageing, tests to me made in the mix design study, etc.);
  • evaluation of environmental benefits such as energy savings, lower CO2 emissions and reductions in harmful emissions, using specific calculation models (software packages).

The results of this research have been reported in several publications and during a workshop organized by BRRC.

De Visscher J., Vervaecke F., Vanelstraete A. e.a.,
Asphalt production at reduced temperatures and the impact on asphalt performance.
International Symposium on Asphalt Pavement and the Environment, ISAP/EMPA, Zurich (Switzerland), August 18-20, 2008.
ISAP, Dübendorf (Switzerland), 2008, pp. 219-230.

De Visscher J., Vervaecke F., Vanelstraete A, Soenen H., Tanghe T., Redelius P.,
Enrobé à température plus basse – Impact sur les caractéristiques performantielles.
XXIème Congrès belge de la route, ABR/AWV,
Gand, 22-25 septembre 2009, Thème I "Revêtements bitumineux”, 10 p.

De Visscher J., Vervaecke F., Vanelstraete A. e.a.,
Foamed bitumen in half-warm asphalt: a laboratory study.
II International Conference on Environmentally Friendly Roads (ENVIROAD 2009),
MT Polska, Warsaw (Poland), Oktober 15-16, 2009, 12 p.

De Visscher J., Vanelstraete A., Soenen H., Tanghe T., Redelius P,
Asphalt production at reduced temperatures and the impact on asphalt performance.
11th International Conference on Asphalt Pavements,August 1-6, 2010, Nagoya, Japan.

De Visscher J., Vanelstraete A., Soenen H., Tanghe T., Redelius P.,
Performance of asphalt produced at reduced temperatures.
3rd TRA Conference, June 7-10, 2010, Brussels.

Journée d’étude «L’enrobé à température réduite : l’avenir?», CRR, 20 septembre 2011.