Articles in Taxonomy

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:

Extraction and recovery of binders from bituminous mixtures prepared with polymer-modified bitumens

This four-year project (July 2006 – June 2010) was funded by the Belgian Bureau for Standardization (NBN). Its objective was:

  • to improve the procedures for the extraction (with a continuous flux centrifuge) and recovery (with a rotary evaporator) of binders from bituminous mixtures prepared with polymer-modified bitumens (PmBs) (EN 12967-1 and -3);
  • to study and improve the procedure for the determination of binder content by ignition (EN 12697-39).

Sectoral operator: E396 Earthworks

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In 2009, the European Committee for Standardization (CEN) decided to form a technical committee TC 396 Earthworks .

This committee is to prepare European standardization in the field of earthworks.

It is working on the following topics (each representing a separate part of the future standard):

Sectoral operator for E227 Road Materials

Ever since CEN/TC 227 Road Materials was formed in the late eighties, that is, before there were any plans to reorganize the standardization landscape in Belgium, BRRC has been a pioneer and an active participant in this committee. The main focus at the time was on the activities of WG1 Bituminous Mixtures and WG2 Surface Dressing, Sprays and Slurry Surfacing (incorporating Microsurfacing).

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European standards for surface dressings and slurry surfacings

The European standards for surface dressings (EN 12271 Surface dressing – Requirements) and slurry surfacings (EN 12273 Slurry surfacing – Requirements) have been approved by CEN working group TC227/WG2. One of the prominent features of these standards is that they set performance requirements rather than prescribing “recipes”. For some requirements the standards leave a number of options to the countries themselves.

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