Articles in Taxonomy

Surface analysis

We do not instantly think of it when travelling on a road, but it is worth having a closer look at the road surface. Quite a few interesting characteristic properties can be derived from a road surface condition survey. The results of non-destructive measurement methods are converted into «indicators» that are easy to understand – usually a figure on a scale.


Earthworks and (sub)base layers

Earthworks and earthmoving projects are indisputably important in the construction of transport infrastructure. They have a decisive impact on the economics and environment-friendliness of a road project and more generally on the observance of the concept of sustainable development.

The specifications applying to the execution and inspection of earthworks wary widely from one country to the next. One of the objectives of CEN technical committee TC396 Earthworks is to try and harmonize them.

Visual assessment of defects in surface dressings (according to NBN EN 12272-2)

This test method describes how the defects in a surface dressing can be visually assessed. These defects include fatting up, tracking, bleeding, scabbing, tearing, fretting, and streaking (more information on these various forms of distress can be found in BRRC’s code of good practice R71/01 “Code de bonne pratique pour les enduits superficiels”).

Damage can be assessed in two ways: qualitatively and quantitatively.

A qualitative method will assess the rate of damage by simple rules. The quantitative method will measure the defects in much more detail.


Rate of spread and accuracy of spread of binder and chippings for surface dressing (according to NBN EN 12272-1)

These test methods were developed to measure rates of spread on site, both longitudinally and transversely. The transverse measurements are used to check the operation of chipping and binder spreaders, and the longitudinal measurements to verify whether the rates declared by the contractor have actually been spread on site.


Characterization of recycled materials for use in road construction and determination of permanent deformations with the cyclic load triaxial test

Project carried out with financial support from the Federal Public Service (FPS) Economy, SMEs, Self-Employed and Energy (Contracts CC CCN/PN/NBN-506 and CC CCN/PN/NBN-556 – 1st September 2008 - 1st September 2010)