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California Bearing Ratio (CBR) Testing

California Bearing Ratio (CBR) values are used for road pavement design.

Depending on the ground conditions, a number of methods of in-situ testing, which may be supplemented with laboratory testing, can used to obtain CBR values:

Conventional in-situ CBR testing in accordance with BS 1377: Part 9;

Dynamic Cone Penetrometer (DCP) testing; provides a CBR profile with depth and is a relatively rapid test; and

In-situ plate bearing testing, preferred in coarse-grained soils that are unsuitable for conventional CBR or DCP tests, can take a relatively long time.

Case Study

Highway Investigation Works Adjacent to Live Highway, Cornwall

In-situ California Bearing Ratio (CBR) testing was undertaken to provide a design CBR value for road pavement design. The testing was to be undertaken within a highway ve...

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