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Home » Our Products » Soil Testing » California Bearing Ratio
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California Bearing Ratio

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-1019
Laboratory CBR Apparatus, Manual, 50 KN
Same as SSO-1020 but having manual operation
Shivam Instruments India
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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Liquid Limit

The liquid limit, defined as the moisture content at which the soil passes from the plastic state to the liquid state, is very helpful in the classification of the potential properties of the soil material. The liquid limit gives a measure of the shearing resistance which a soil has when mixed with water. Casagrande Method or Cone Penetrometer Method can determine the liquid limit of soil.

Casagrande's Method
IS: 2720 (Part 5), IS: 9259, BS: 1377, ASTM: 89
The Liquid Limit Device consists of a hard rubber base carrying a sliding carriage assembly to which a brass cup is hinged. The cup is raised and allowed to fall through a height of 1 cm on to the hard rubber base, by the help of a lead screw provided at the back of the sliding carriage. Supplied complete with Casagrande Grooving Tool and Gauge Block (Type A of IS: 9259)
SSO-1022
Liquid Limit Device complete with Casagrande's grooving tool and gauge block
Shivam Instruments India
SSO-1022001
Casagrande's Grooving Tool and Gauge Block
SSO-1022002
ASTM Grooving Tool
SSO-1022003
Bowl
SSO-1022004
Gauge Block
SSO-1023
Liquid Limit Device complete with Casagrande's grooving tool, gauge block and Counter
SSO-1023001
Counter
Shivam Instruments India
SSO-1024
Liquid Limit Device, Motorised, complete with Casagrande's grooving tool, gauge block and Counter
Loadframe
SSO-1025
Load Frame, Motorised 50kN (5000kgf), single speed
This equipment is designed for applying loads in triaxial compression, unconfined Compression and CBR tests on soils. This is a constant rate of strain type of unit. The Capacity of the unit is 50 kN (5000 kgf). This is compact unit comprising a load frame provided with a motor and a gearbox. The unit is suitable for operation on 220 volts, 50 cycles, single phase, AC supply. It is sturdy, two pillar type load frame and can be used in the mobile laboratory also.
Shivam Instruments India
SSO-1026
Load Frame, 50kN (5000kgf), hand operated
This equipment is designed for general test and applying loads in triaxial compression, unconfined Compression and CBR tests on soils..
SSO-1027
Load Frame, Motorised 50kN (5000kgf), three speed
Same as SSO-1025 but has three speed.
SSO-1028
Load Frame, Motorised 50kN (5000kgf), six speed
Same asSSO-1025 but has three speed.
SSO-1029
Load Frame, Motorised, 30 speeds,50 KN (5,000 kgf)
.Features Specification
The Load Frame consists of a cabinet which houses the gear system and motor with sturdy angle iron frame. The loading is done through the bottom loading platen, which is carried on a lead screw which advances upwards. The top load bracket, which slides over two upright pillars, can be positioned at any desired height and locked. It carries a hexagonal screw adapter for standard proving rings. The loading part of the unit is detachable from the main unit for ease of transport and to avoid damage to the tension rods. Rates of strain: 30, between 6 mm / min and 0.00048 mm/min. By interchanging the drive and driven gears, another set of 24 rates of strain can be obtained. Suitable for operation on 230 V, 50 Hz, single phase, AC Supply.
SSO-1030
Load Frame, Motorised, 12 speeds, 200 kN (20,000 kgf)
.Features The Load Frame is extremely versatile and designed to conduct triaxial shear test on soil and rock specimens.
Specification
The instrument consists of a cabinet, which houses the gear system and motor with sturdy angle iron frame. The loading is done through the bottom loading platen, which is carried on a lead screw, which advances upwards. The top load bracket, which slides over two upright pillars, can be positioned at any desired height and locked. It carries a hexagonal screw adaptor for standard proving rings. The loading part of the unit is detachable from the main unit for ease of transport and to avoid damage to the tension rods. Rates of Strain: 12 (between 1.25 and 0.00032 mm/min) Suitable for operation on 230 V, 50 Hz, Single Phase, AC Supply.
SSO-1031
Load Frame, Motorised,
490 kN (50,000 kgf)
The Load Frame is designed for conducting triaxial shear tests on rock specimens, but its use can be extended to any field where there is a requirement of the rates of strain of this load frame to be applied. This load frame gives a choice of twelve rates of strain from a maximum of 5mm/min to 0.000125mm/ min. Suitable for operation on 3 Phase, 415 V, AC Supply.
Specification
It consists of a cabinet housing the electric motor, reduction gear and the turret gear box. Two pillars are fitted on the base over the cabinet. The load is applied by advancement of a lead screw. A suitable adapter is provided for fixing a 500 kN capacity proving ring which is supplied at extra cost. This load frame has a platen of about 25 cm dia to house the High Pressure Triaxial Cell.

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Permeability

Permeability is the property of soil, which permits flow of water through its interconnecting voids. Permeability is an important engineering property, which governs the rate of settlement of saturated compressible soil layers and the rate of flow of aquifer. Permeability is taken into account for pumping ground water, spacing well points for de-watering foundation sites for excavation, retention of water in reservoirs, design of dams and selection of soils to be used for various zones of embankments of dams and reservoirs. Coefficient of permeability can be computed from effective diameter of particles, porosity, specific surface and from consolidation test results. But permeability depends on numerous factors; hence, it is always considered more accurate to determine permeability by direct laboratory method using an apparatus called Permeameter. Specimen used in a Permeameter is small, time taken is less and results obtained are accurate. There are two types of Permeameters, namely Constant Head Permeameters and Falling Head Permeameters. Falling Head permeameters are used for testing remoulded or undisturbed fine-grained soil having less than 10-2 cm/sec coefficient of permeability. Constant Head Permeameters are used for coarse-grained cohesion less soils. we supplies a wide range of Permeameters meeting the requirements of research and routine testing of permeability of soil specimens

SSO-1032
Permeability Apparatus. Constant head
SSO-1033
Permeability Apparatus. Falling head

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Pore Pressure

The pore pressure measuring apparatus consists of a screw pressure pump, null indicator in Perspex, pressure gauge, mercury manometer, volume change burette and the necessary connecting tubes and valves. It is used for measuring pore water pressure and pore air pressure in soils. It has many features, which simplify the operation. The Null Indicator is made from a transparent Perspex block. It is a simplified U-Tube Null Indicator, in which water can bypass mercury if null indicator is tilted; thus de-airing process by circulation of water is facilitated. All features enable a visual check to be made during the de-airing operation of apparatus. A mercury manometer and a pressure gauge of Bourdon Tube type are provided on the panel on which the whole equipment is mounted. Very small positive or negative pressures are observed on the manometer. A 50 ml burette is clamped to a sliding bracket on one side of the panel. It is used for measuring the volume change in the specimen when subjected to confining pressure in the triaxial cell The following models of Pore Pressure Apparatus are offered

Shivam Instruments India
SSO-1034
Pore Pressure Apparatus, 1000 kPa (10 kg/cm2) capacity
SSO-1035
Pore Pressure Apparatus, 2000 kPa (20 kg/cm2) capacity
The equipment consists of
Pressure Gauge, Bourdon Tube Type, Graduation: -1.0 to +10 bar in 0.1 bar division (or -100 to +1,000 kPa in 10 kPa divisions) Dia: 200 mm
Pressure Gauge, Bourdon Tube type, Graduation: 0 to 20 bar in 0.1 bar Divisions. (or 0 to 2,000 kPa in 10 kPa divisions) Dia : 200 mm
Manometer, Glass U Tube, measures low positive and negative pore pressure and checks zero error of pressure gauge. It is provided with a mercury trap. (Mercury supplied at extra cost)
Null Indicator, Perspex with mercury trap and cursor to indicate the mercury level
Burette, 50 ml, for measurement of volume change in the soil specimen
Pressure Pump, fitted with four Ball Valves
Copper Coil
Water Reservoir
Note All the above parts are fixed on a panel suitable for mounting on the wall.
SSO-1036
Proctor Penetrometer, Spring Type, 0-40 kg x 1
SSO-1037
Proctor Penetrometer, Hydraulic Type, 0-40 kg x 2

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