The Two-Speed ASTM Field CBR Loading Jack has 10,000 lbf (45kN) capacity with 3-1/2" (89mm) lift. Supplied with swivel base and crank handle. The Piston Extension Set and Connector Set are needed to attach and properly space the Jack, Load Ring, and Piston assembly in use. The 8-ft. (2.4m) Dial Support Bridge and Magnetic Gauge Holder position the Penetration Dial Gauge for measuring penetration strain. The Surcharge Plate and Surcharge Masses are placed around the piston to simulate the load or pavement which will overlie the in-situ test material.
The California Bearing Ratio (CBR) field test yields relative strength of in-situ soils and some base course materials. This is often as valuable to the pavement designer as laboratory CBR values. 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. Typically, the reaction load used for testing is a heavy piece of equipment such as a loaded dump truck.
Components of CBR Equipment are ordered individually to form a full set for tests according to ASTM method.
Meets Test Methods:
ASTM D 1883
ASTM D 4429