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California Bearing (CBR) Apparatus

California Bearing (CBR) Apparatus

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CALIFORNIA BEARING RATIO TEST APPARATUS, MOTORISED AS PER 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 payment 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 of the two pillars. Suitable operation on 220 volts, 50Hz, single phase A.C.supply.
  • C.B.R. mould made of M.S., 150mml.D.X 175mm high with extension collar 150mm. I.D. X 50mm high.
  • Penetration Piston having 50mm.face dia.
  • Adjustable bracket for Penetration Dial gauge.
  • Circular metal weight, 2.5kg, 147mm.dia with 53mm.dia central hole.
  • 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