Articles in Taxonomy

Visual assessment of defects in a slurry surfacing (according to NBN-EN 12274-8)

This test method points out how defects of slurry surfacing can be visually assessed. Defects in slurry surfacing include bleeding and fatting up, delamination, loss of aggregate, wearing, lane joint gaps, rutting, slippage, corrugation, bumps and ridges, and groups of small defects or small repetitive defects.

They 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.

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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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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.

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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.

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