California Bearing Ratio Field Equipment

The California Bearing Ratio (CBR) field test is optimal for measuring the relative strength of in–situ soils and some base course materials for use in pavement design. Field tests are run by forcing a piston into the soil at the test site and comparing the load on the piston to the depth of penetration.


Components of Gilson's Field CBR Equipment are ordered individually for tests performed according to ASTM or Army Corps of Engineers (C.O.E.) methods. Select an ASTM or C.O.E. Jack, English or metric Penetration Dial Gauge, Load Rings, and other components required. Additional surcharge masses may be needed to simulate large pavement loads.
  • Field CBR Loading Jacks with swivel bases are available in two models, the two-speed BR-2 with a 10,000lbf (45kN) capacity and a 3-1/2in (89mm) lift, and the three-speed BR-3 with a 2in (51mm) maximum lift.
  • Penetration Piston for CBR Test is forced into the soil at a test site to determine CBR values in compliance with ASTM and COE methods.
  • Penetration Dial Gauges and Load Rings measure penetration and applied force. A Dial support Bridge and mounting accessories position the Dial Gauges for measuring penetration.
  • CBR Surcharge Plate and Masses are used to simulate confining loads from base course and pavement.