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Choice of surfacing type
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The right choice of structure and constituent layers is a primary concern to designers in both the private (engineering consultants, architects) and the public sector (technical departments of municipalities, provinces and regions) who have to make designs for new roads or for maintenance, renovation and adaptation works to existing infrastructure.
Although the focus is mainly on road structures, the area of activity also includes many related structures such as surfacings of airfield runways and car parks (also roof-top), on bridge decks, and of storage yards, footways and cycle tracks, tramways and some sports fields.
As a matter of course, the choice is based on the intrinsic performance characteristics of the various types of surfacing. However, numerous other factors also need to be considered – such a traffic, climate, safety and comfort, the environment, the type and condition of the existing surfacing, the field of application, the period of execution and the completion time, and costs.
The technical standard specifications will provide the designer (or decision-maker) with the technical characteristics of products, but will hardly give him any indications for the choices to be made. It is, therefore, important to help him make a well-advised choice from the many types of surfacing defined in the specifications
In this respect we refer to the following BRRC codes of good practice (only in French or Dutch):
- R78/06 Code de bonne pratique pour le choix du revêtement bitumineux lors de la conception ou de l'entretien des chaussées;
- R83/12 Code de bonne pratique pour la conception, la mise en œuvre et l’entretien des complexes étanchéité-revêtement de ponts à tablier en béton.
For the application of coloured asphalt specific aspects (mix design, production, laying) require particular attention. Those points of special attention are described in BRRC's File 17 Les enrobés bitumineux colorés – Recommandations pratiques pour le choix des matériaux, la conception et la mise en œuvre – Détermination objective de leur couleur (only in French or Dutch).