AZ ROC R-13 Asphalt Paving Practice Questions - Arizona ROC R-13 Asphalt Paving Examination Exam

What does the Plasticity Index (PI) of a subgrade soil measure?

The range of moisture content over which the soil behaves plastically (PI = Liquid Limit - Plastic Limit) The ratio of coarse aggregate to fine clay particles in the soil mass The percentage of soil volume occupied by trapped air voids after compaction The speed at which water drains through a saturated soil column

Correct Answer:

The range of moisture content over which the soil behaves plastically (PI = Liquid Limit - Plastic Limit)

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