The California Bearing Ratio (CBR) is a penetration test for evaluation of the mechanical strength of road sub grades and base courses. The CBR test is performed by measuring the pressure required to penetrate a soil sample with a plunger of standard area. The measured pressure is then divided by the pressure required to achieve an equal penetration on a standard crushed rock material.

QUALITY STANDARD: CONFORMING TO IS 2720 (P-XVI), IS 9669-80
a. 50 KN (5000 kgf) Capacity with Strain Rate of 1.25 mm per minute.
b. Load Frame, Electricity cum Manually Operated 220 V, Single Phase AC Supply.
c. CBR Mould with collar & base plate.
d. Penetration Piston, 50 mm dia with bracket.
e. Perforated Brass Swell Plate with stem & locknut.
f.  Displacer Block 148 mm dia with T-Handle.
g. Annular & Slotted Metal Weight 2.5 kg.
h. Aluminium Tripod Stand.
i.  Rammer 50 mm internal dia 2.6 kg & 4.89 kg.
j.  Proving Ring 10 kn capacity with Calibration Certificate in teak wooden carrying case.
k. Dial Gauge 0.01 mm x 25 mm travel.