Question: Standard and modified compaction tests are performed on a soil in the laboratory, and the following results are obtained: OMCstd = 2 3 . 4

Standard and modified compaction tests are performed on a soil in the laboratory, and the following
results are obtained: OMCstd=23.4%, MDDstd=15.19kN/m3
, OMCmod=21.6%, MDDmod=15.75
kN/m3
. An in-situ density test is performed in the field, in which 4.988kg of soil with a gravimetric
water content of 19.2% is excavated from a hole which is 2650cm3
. The earthworks specification
requires that earthworks are compacted to density ratios of 102% of the Maximum Dry Density
achieved under standard compaction, or 98% of the Maximum Dry Density achieved under modified
n= e
(1+ e)\theta = Sr n S r e= w Gs
\theta = w Gs
(1+ e)
Water content [%]6.28.19.812.313.2
Bulk Unit Weight [kN/m3
]17.719.320.521.121.1
compaction. Does the compacted soil meet the specification? (

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