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The type of subgrade soils and their strength plays a critical role in the design and performance of pavements. In 1929, California Division of Highways developed a laboratory test to evaluate the suitability of a material for use in highway construction as a subgrade, and sub-base and base courses. The test is called California Bearing Ratio or CBR test. During the World War II, the US Army Corps of Engineers adopted this test, with some modification, for use in airfield construction. This video presents basic discussion on types of pavements, importance of CBR tests, procedure to perform soaked and unsoaked CBR tests, and interpretation of CBR test data.

Learning Objectives:

• Typical pavement structures
• Determination of CBR of laboratory compacted soils
• Understanding and performing soaked and unsoaked CBR tests
• Determination of liquid limit and plastic limit
• Understanding of Plasticity Chart, A-Line and U-Line
• Significance of CBR values
• Possible errors associated with the test

Instructor Information: Sanjeev Kumar, P.E.

Course Length: 45 Minutes