Laboratory C.B.R. Apparatus, IS: 2720 (P-XVI), IS:9669.BS:1377,1924, ASTM D1883, AASHTO T193
The CBR Test is used for determining the relative bearing ratio and expansion characteristics under known surcharge weights of base, sub-base and sub grade soils for the design of Roads, pavements, & Runways. Tests can be conducted on all types of soils including sand ,gravel & washed stone (passing through 20 mm IS Sieve). The CBR test is used extensively in selection of materials and control of sub grades.
The procedure consists of loading soil with a circular piston, 50 mm dia face and maintaining a penetration rate of 1.25 mm/min strain. The load is noted and the results of test on natural or re compacted soils, in soaked and un soaked conditions can be compared with standard test results. CBR App. Consists of the following:-
C.B.R. Apparatus, motorized-cum-hand 50 KN cap. with 1.25 mm/min rate of
strain. Operation on 230 V, single phase, A.C. 50 Hz.