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.
Rammer 2.6kg x 310mm. controlled fall.
Rammer 4.89kg x 450mm. controlled fall.
Proving Ring capacity 50kn, fitted with dial gauge