The CBR test is used for determining the relative bearing ratio and expansion characteristics under known surcharge weights of base, sub-base and sub grade soils for the design of roads, pavements....
The CBR test is used for determining the relative bearing ratio and expansion characteristics under known surcharge weights of base, sub-base and sub grade soils for the design of roads, pavements and runways. Tests can be conducted on all types of soils including sand, gravel and washed stone (passing through 20 mm IS Sieve). The CBR test is used extensively in selection of materials and control of sub grades. The procedure consists of loading soil with a circular piston, 50 mm dia face and maintaining a penetration rate of 1.25 mm/min. The load is noted and the results of test on natural or recompacted soils, in soaked and unsoaked conditions, can be compared with standard test results.
SSO-1020
Laboratory California Bearing Ratio Test Apparatus, Motorised IS: 9669 - 1980 IS: 2720 (Part 16) - 1979 The apparatus consists of
SSO-1020001
Mould 150 mm ID x 175 mm high Gun Metal
SSO-1020002
Mould 150 mm ID x 175 mm high M. steel
SSO-1020003
Metal Tripod for Dial Gauge
SSO-1020004
Penetration Piston 50 mm face dia
SSO-1020005
Circular Metal Spacer Disc with detachable handle, 148 mm dia x 47.7 mm height
SSO-1020006
Perforated Plate 148 mm dia, with adjustable Stem and Lock Nut
SSO-1020007
Soaking Tank for six CBR mould
SSO-1020008
Extension Collar 150 mm ID x 50 mm high
SSO-1020009
Annular Metal Weight 2.5 kg, 147 mm dia with 53 mm dia central hole
SSO-1020010
Slotted Metal Weight, 2.5 kg, 147 mm dia, with 53 mm dia slot
SSO-10200011
Swell Plate
SSO-10200012
Cutting Collar
SSO-10200013
Loading load frame foe CBR hand operated 2 speed
SSO-1021
California Bearing Ratio Test Apparatus, Field Type IS: 2720 (Part 31) The use of the in-situ CBR apparatus on large road construction projects has increased considerably in recent years. This apparatus, mounted on a rolled steel joist cantilevered from the back of the truck or fitted to the underside of a mobile frame, can be used to determine the bearing capacity of soils quickly and efficiently. This method of testing in-situ, using piston penetration, is useful for determining the load carrying capacity in the field, when the in-place density and water contents are such that the degree of saturation is 80 % or greater, when the material is coarse grained and cohesion less so that it is not affected by changes in the water content and when the material has been in place. It consists of: 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. Swivel Head Swivel Head Penetration Piston 50 mm dia threaded at the upper end, to connect to the various lengths of extension sleeves, through a connector 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 Connector Set has eight connectors for coupling the penetration piston and proving ring assembly, either directly or through extension pieces Datum Bar Assembly consisting of two stands and 1 m long Bar Adjustable Bracket for mounting the Dial Gauge Annular Metal Weight 5kg, 250 mm dia with 53 mm dia central hole Slotted Metal Weight 5kg, 215 mm to 250 mm dia with 53 mm dia slot, 2 Nos. Slotted Metal Weight 10kg, 215 mm to 250 mm dia with 53 mm dia slot, 2 Nos. Optional Extra Dial Gauge 0.01x25 mm Proving Ring 50 kN (5,000kgf) capacity
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