Practice

A field density test on a lean-clay roadway subgrade lift gives a total (moist) unit weight of $\gamma_t=105.5$ pcf at a water content of $w=12.5\%$. The standard Proctor test on the same soil gives a maximum dry unit weight of $\gamma_{d,\max}=108.0$ pcf at an optimum water content of $w_{opt}=16.5\%$, and the specification requires 92% relative compaction. The relative compaction achieved is most nearly:

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