The California Bearing Ratio test, (usually called CBR test) is an empirical test developed in California, USA for determining the Relative Bearing Ratio and expansion characteristics under known surcharge weight of base, sub-base and sub grade soils for the design of roads, pavements and runways. The CSR test is used extensively in selection of materials and control of subgrades. The test can be performed in the laboratory on prepared samples or in-situ on location. It is important to appreciate that this test, being of an empirical in nature, is valid only for the application for which it was developed i.e., the design of highway base thickness.
Ref. Standards IS:9669, IS: 2720 (Part XVI), BS 1377; 1924; EN 13286-47/ ASTM D 1883; AASHTO 193
Models available:
Laboratory California Bearing Ratio TestApparatus, Motorised, Three speed (with GM Mould) (AIM 120 )
Laboratory California Bearing Ratio Test Apparatus, Motorised, Three Speed (with MS Mould) (AIM 120-MS )
Laboratory California Bearing Ratio Test Apparatus, Motorised with AIM-062E Load Frame four Speed (AIM-120-1)
Laboratory California Bearing Ratio Test Apparatus, Motorised, Four Speed with Mild Steel Mould (AIM-120-MS-3)
Laboratory California Bearing Ratio Test Apparatus, Motorised, Three Speed, Electronics (AIM 121 )
Laboratory California Bearing Ratio TestApparatus, Motorised, Electronics with DAQ &GeoStar (AIM 121 -1 )
Laboratory California Bearing Ratio Test Apparatus, Electronic with AIM-062E Load Frame four speed (AIM-121-2)
Laboratory California Bearing Ratio Test Apparatus, Motorised, Electronics with AIM-062E Load Frame four speed and AIMIL Data Aquisition System &GeoStar (AIM-121-3)