CBR Test

The CBR test is used to evaluate the subgrade strength primarily of roads, pavements and foundations. It often forms part of the overall site investigation and is useful for determining the thickness of materials needed for the proposed construction.

In general, if you are looking at measuring subgrade strength for road design or construction then CBR values would be the normal. The complicating factor here though is the material being tested. If there are particles in the subgrade that exceed 20mm then the traditional CBR test may not be valid and it would probably be best to go for an equivalent CBR test, which is the plate bearing test with an added calculation. The harder the surface, the higher the CBR value.

Tests are most usually undertaken at surface level or at depths of between 500-1000m, most commonly in 20-30mm intervals along the proposed construction centreline.

Get in touch for a quote or to arrange a CBR test at your site by calling us on 0203 659 0524 or emailing us at info@concretetestingsolutions.co.uk.