CBR Values for Road Pavement Design, Cornwall
Ruddlesden geotechnical were commissioned to undertake California Bearing Ratio (CBR) testing to provide a design CBR value for road pavement design.
The testing was to be undertaken within a highway verge of an 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, supplemented with UKAS accredited laboratory testing, used to calculate a representative CBR value for design.
Bearing pressures were also provided for used in foundation design of highway signage.