What does CBR stand for?

The acronym CBR stands for California Bearing Ratio. This term is widely used in civil engineering and pavement design to assess the strength of subgrade soil and its ability to support traffic loads. The CBR is determined by measuring the pressure required to penetrate a soil sample with a standard piston, compared to the pressure needed to penetrate a sample of crushed stone with a known strength.

The California Bearing Ratio is particularly valuable because it provides a quick and reliable way to evaluate the bearing capacity of different soils, which is critical in designing and constructing roads, runways, and other paved surfaces. Higher CBR values indicate stronger subgrades that can support heavier loads, while lower values suggest weaker soils that might require additional treatment or support to ensure adequate performance.

Understanding the California Bearing Ratio is essential for engineers when selecting appropriate materials and designing structures that will endure various loads and environmental conditions. This knowledge ensures the longevity and safety of constructed facilities.