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The initial concavity in the load-penetration curve of a CBR test is not due to

1. uneven top surface
2. high impact at start of loading
3. inclined penetration plunger
4. soft top layer of soaked soil

Correct answer: soft top layer of soaked soil

Solution

The initial concavity in a CBR load-penetration curve is generally due to surface irregularities, impact at the start, or an inclined plunger. A soft top layer of soaked soil affects the soil response, but it is not the usual cause of the initial concavity artifact.

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