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C.B.R Test Apparatus (India)

C.B.R Test Apparatus
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CALIFORNIA BEARING RATIO TEST APPARATUS, MOTORISED AS PER IS : 2720(PARTXVI)

The CBR test is used for determining the relative bearing ratio and expansion characteristics under known surcharge weight of base, sub-base and subgrade soils for the design of roads, pavements and runways.

SPECIFICATION

The apparatus consists of :

• LOAD FRAME : Load Frame motorized capacity 50kN(5000kgf) having 3 rates of strains i.e 1.25, 1.5 and 2.5mm/minutes. It consists of a screw jack with a detachable handle. The lower platen moves up and down. The top bracket is adjustable for vertical clearance and has an adaptor for connecting standard Proving Rings. A dial gauge mounting bracket is provided on one of the two pillars. Suitable operation on 220 volts, 50Hz, single phase A.C. supply.

• C.B.R. Mould made of M.S., 150mmI.D. X 175mm. high with extension collar 150mm I.D. X 50mm high.

• Perforated base plate for the above mentioned mould made of gunmetal.

• Penetration Piston having 50mm. face dia.

• Adjustable bracket for Penetration Dial gauge.

• Circular Metal Spacer Disc with detachable handle, 148mm. dia x 47.7mm. high.

• Annular Metal Weight, 2.5kg, 147mm. dia. with 53mm. dia. central hole.

• Slotted Metal Weight 2.5kg., 147mm. dia. with 53mm. dia. slot.

• Perforated Plate 148mm. dia. with adjustable stem and lock nut.

• Metal Tripod made of C.I for Dial Gauge.

• Cutting Collar.

• Rammer 2.6Kg X 310mm. controlled fall.

• Rammer 4.89Kg X 450mm. controlled fall.

• Proving Ring capacity 50kN, fitted with dial gauge 25mm. travel and 0.01mm. least count with or without RTC calibration certificate.

• Dial Gauge 25mm. travel and 0.01mm. least count