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This document discusses insitu testing methods for evaluating soil properties beneath highways and runways. Specifically, it describes the insitu California Bearing Ratio (CBR) test, which measures the penetration resistance of a piston pushed into undisturbed soil. A rough CBR value can be estimated based on thumb penetration. CBR values correlate to the quality of the soil subgrade, ranging from very poor (<3) to good (>10). The CBR value provides an indication of the soil

Author

Marcus Vinicius

Language

EN