A fine-grained soil is found to have a liquid limit of 90 percent and a plasticity index of 51. The natural water content is 28 percent. (a) Determine the liquidity index and indicate the probable...

A fine-grained soil is found to have a liquid limit of 90 percent and a plasticity index of 51.

The natural water content is 28 percent.

(a) Determine the liquidity index and indicate the probable consistency of the natural soil.

(b) Classify this soil according to the Unified Soil Classification System, and also according to the AASHTO system.