Question
Download Solution PDFThe standard loads corresponding to 2.5 mm and 5.0 mm deformation in California Bearing Ratio (CBR) Test are.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
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The CBR test is a penetration test used to evaluate the strength of subgrade soil and base materials for roads, airfields, and pavements.
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The test measures the pressure required for a standard plunger to penetrate the soil to a certain depth (2.5 mm and 5.0 mm), and expresses it as a percentage of a standard load.
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The standard loads for comparison are:
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At 2.5 mm penetration, the standard load is 1350 N.
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At 5.0 mm penetration, the standard load is 2055 N.
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Additional Information
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Higher CBR values indicate stronger subgrade materials capable of supporting heavier loads.
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The test is a standard procedure for pavement design under light, medium, and heavy traffic.
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The penetration rate (1.25 mm/min) is standardized for consistent results across tests.
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