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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