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The California Bearing Ratio ( CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering. [1] .
The California Bearing Ratio or CBR test is performed in construction materials laboratories to evaluate the strength of soil subgrades and base course materials.
California bearing ratio test (CBR) is defined as the ratio force per unit area which is required to penetrate a mass of soil with the standard circular piston at a rate of 1.25 millimeters per minute to that required for corresponding penetration of standard material.
12 Feb 2024 · The California Bearing Ratio (CBR) is described as the ratio of the force per unit area needed to penetrate a soil mass using a standard circular plunger with a diameter of 50 mm, at a consistent rate of 1.25 mm/min, to that needed for an equivalent penetration of a standard material.
The California Bearing Ratio (CBR) test is a simple strength test that compares the bearing capacity of a material with that of a well-graded crushed stone (thus, a high quality crushed stone material should have a CBR @ 100%).
The California Bearing Ratio (CBR) test is a measure of resistance of a material to penetration of standard plunger under controlled density and moisture conditions. It was developed by the California Division of Highways as a method of classifying and evaluating ...
16 Apr 2017 · The California Bearing Ratio Test (CBR Test) is a penetration test developed by California State Highway Department (U.S.A.) for evaluating the bearing capacity of subgrade soil for design of flexible pavement.
7 Nov 2023 · California Bearing Ratio (CBR) testing is a reliable measure of soil strength and stiffness used for pavement design. The California Bearing Ratio test involves laboratory and field-testing methods to calculate the resistance of soil samples, classify soils, and assess foundation stability.
California bearing ratio is the percentage of stress a soil specimen can resist for a certain amount of penetration relative to the value of stress of which a standard soil could resist. Basically, the value is an indicator of the strength of the soil.
1 Jan 2018 · The California bearing ratio (CBR) is an index that compares penetration resistance of laboratory-compacted soil material to that of a durable, well-graded ( poorly sorted ), crushed rock material.
