Field California Bearing Ratio
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Field California Bearing Ratio
The in-situ California Bearing Ratio (CBR) apparatus has become increasingly vital in large road construction projects due to its ability to efficiently assess the bearing capacity of soils. Mounted on a rolled steel joist cantilevered from a truck or attached to a mobile frame’s underside, the apparatus enables rapid field testing through piston penetration. This method is particularly effective under specific conditions: when soil has a saturation degree of 80% or higher, when the material is coarse-grained and cohesionless (unaffected by water content changes), and when the material is already in place. These characteristics make the in-situ CBR test a practical tool for determining load-carrying capacity directly in the field, ensuring reliable data for road design and construction.
STANDARD FOLLOWING
IS 2720 (PART-31), IS 12287
DESCRIPTION
| BE 27-01 | Loading Jack | with U-bracket, capacity 50 kN (5,000 kgf). This is specially designed for use with Field CBR test apparatus. It consists of a hand operated, two speed, screw jack fitted with a U-bracket. A hexagonal adapter is provided to fix a proving ring. A thrust bar, which passes through the U-bracket, is screwed on to a proving ring (supplied at extra cost) which protects the proving ring when the loading is eccentric. |
| BE 27-02 | Proving Ring | 50 kN (5,000kgf) capacity |
| BE 27-03 | Dial Gauge | 25 x 0.01 mm |
| BE 27-04 | Slotted Metal Weight | 10 kg, 215 mm to 250 mm dia with 53 mm dia slot 2 Nos. |
| BE 27-05 | Slotted Metal Weight | 5 kg, 215 mm to 250 mm dia with 53 mm dia slot – 2 Nos. |
| BE 27-06 | Annular Metal Weight | 5 kg, 250 mm dia with 53 mm dia central hole |
| BE 27-07 | Adjustable Bracket | for mounting the Dial Gauge |
| BE 27-08 | Datum Bar Assembly | consisting of two stands and 1 m long Bar |
| BE 27-09 | Connector Set | consists of eight connectors for coupling the penetration piston and proving ring assembly, either directly or through extension pieces |
| BE 27-10 | Extension Set | consisting of 1 length of 5 cm, 2 lengths of 10 cm, 1 length of 30 cm, 1 length of 50 cm and a length of 100 cm used as spacers between the proving ring and penetration piston. The lengths are machined from steel tubing |
| BE 27-11 | Penetration Piston | 50 mm dia threaded at the upper end, to connect to the various lengths of extension sleeves, through a connector |
| BE 27-12 | Swivel Head | for the Loading Jack |