This article outlines different types of the determination of CBR values. The long term CBR or Stiffness Modulus (Ms) of the subgrade soils at equilibrium suction indices (ESI) must be undertaken in the laboratory. The CBR tests and associated sampling will be repeated across various locations along the proposed roads or car parking areas at regular intervals to determine a representative CBR value. Prior to the placement of the capping layer and/or subbase materials, pavement and paved car parking areas, the California Bearing Ratio (CBR) test need to be undertaken in order to determine the strength of the subgrade natural deposits to satisfy the structural requirements both during the construction (the short term) and the post-construction phase (the long term).ĬBR test results can be gathered either in-situ or within the accredited soil laboratories using samples of the subgrade natural soils to ensure that thickness of the capping layer and/or subbase materials are correct and the underlying subgrade can carry the required loads.
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