Built-in Safety Features
Over-load and over-travel protections to prevent system damage
Description
The California Bearing Ratio (CBR) test method is used to evaluate the strength of subgrade, subbase, and base course material, including recycled materials for use in road and airfield pavement design. The laboratory test uses a circular piston to penetrate material compacted in a mold at a constant rate of penetration.
The CBR is expressed as the ratio of the unit load on the piston required to penetrate 0.1 in. (2.5mm) and 0.2 in. (5.1 mm) of the test material to the unit load required to penetrate a standard material of well-graded crushed stone. The test is beneficial in material quality control and more importantly for design parameters such as thickness of pavement and component layers to ensure long-term performance.
The CBR is expressed as the ratio of the unit load on the piston required to penetrate 0.1 in. (2.5mm) and 0.2 in. (5.1 mm) of the test material to the unit load required to penetrate a standard material of well-graded crushed stone. The test is beneficial in material quality control and more importantly for design parameters such as thickness of pavement and component layers to ensure long-term performance.
Frequently Asked Questions
The LoadTrac II is a versatile load frame that can easily be upgraded to perform additional test types by purchasing required software and accessories. Incremental Consolidation, Swell, Unconfined Compression, and California Bearing Ratio are popular tests performed on the load frame alone. Constant Rate Consolidation is an option with the addition of one FlowTrac pressure & volume control flow pump. Triaxial (UU, CU, CD) and Stress Path testing is possible with one to two FlowTrac flow pumps. For those interested in cyclic/dynamic testing, addition of a Cyclic/RM controller and hardware allows for Resilient Modulus testing, and then combined with a FlowTrac allows for Cyclic Triaxial testing. Contact one of our sales team today to discuss all available configurations and options.
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