What does the California Bearing Ratio (CBR) test evaluate?

The California Bearing Ratio (CBR) test is a crucial method used to evaluate the load-bearing capacity of soil and aggregate materials, particularly in the context of road construction and other civil engineering applications. This test involves comparing the strength of a material to a standard crushed stone under a controlled loading condition.

When conducting the CBR test, samples of the material being tested are subjected to penetration tests using a standardized load. The resulting values are indicative of how well the material can support loads when used as a foundation for pavements or other structures. Higher CBR values indicate better load-bearing capabilities, which are essential for ensuring the durability and stability of road surfaces.

This fundamental assessment helps engineers determine whether the aggregate base material meets specific requirements for strength and stability, influencing design decisions and construction practices. By understanding the load-bearing capacity of the aggregate base through CBR testing, engineers can make informed decisions regarding material selection and structural design, ultimately leading to safer and more efficient transportation infrastructure.