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 verge of an existing A-road. Ruddlesden geotechnical obtained the necessary street works licence and organised the appropriate level of traffic management to protect site operatives.

Trial pits were excavated within the verge to reveal the underlying subgrade. A number of Transport Research Laboratory (TRL) Dynamic Cone Penetrometer (DCP) tests were undertaken to ascertain the strength of the subgrade and, combined with UKAS accredited laboratory testing, calculate a representative CBR value for design.