The sand patch, the 3 metre straightedge and the Benkelman beam go out onto the road; the Vialit plate and the cohesion tester are for surface dressings and slurry surfacings. This is our pavement testing equipment for controlling texture, evenness, deflection, drainage and skid resistance, to EN 13036, NLT and ASTM. Tell us what you need for your project.
| What is checked | Equipment | Standard |
|---|---|---|
| Macrotexture | Sand patch, with glass beads | EN 13036-1, ASTM E965 |
| Evenness | 3 m straightedge with two graduated wedges | EN 13036-7 |
| Deflection | Benkelman beam, 2.5 m (also in NF version) | CNR 141, NF P98-200-2 |
| Permeability of porous asphalt | LCS permeameter | NLT 327 (Spain) |
| Skid resistance | GripTester, towed, with continuous measurement | — |
| Adhesion of surface dressings | Vialit plate | EN 12272-3 |
| Cohesion of slurry surfacings | Cohesion tester, pneumatic | EN 12274-4, ASTM D3910 |
For the density of the freshly compacted layer there is the non-nuclear density gauge, which needs no radioactive material licence and measures from 25 to 100 mm deep.
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The surface irregularities between 0.5 and 50 mm, those left by the gaps between the stones. They drain the water between the tyre and the road and help braking in the wet. The sand patch measures it as mean texture depth: the volume of beads divided by the area of the circle.
The ability of the pavement to give grip to a tyre, especially when the road is wet. It depends on the microtexture, the harshness of each stone, and on the macrotexture. It is measured with wheel-based devices travelling over the wet pavement or, at specific points, with the pendulum friction tester.
To find out how much the pavement sinks under a known load, usually a lorry wheel. A high deflection indicates that the layers or the subgrade are weak. The deflections along a section are used to decide whether it needs strengthening and how thick the overlay should be.
Evenness is how flat the surface is along the road. On acceptance of a layer it is checked with the 3 m straightedge; on long sections the IRI is used, an index in m/km calculated by a profilometer that reflects ride comfort.
The laboratory tests on the mixture and the bitumen are in bitumen and asphalt.
