An experimental compaction curve was found to be below the zero-air-void line. At maximum dry density on the compaction curve, the degree of saturation of the soil is less than 100%. True False
True
At optimum moisture content , the maximum value of dry unit weight for compacted soil is obtained corresponding to the situation when no air voids are left , it is a theoretical limit something that is never achieved in practice because no matter how much compactive effort is applied some air voids will always be there making the degree of saturation less than 100% or totally zero voids.
The condition of zero air voids is only theoretical and soil can never be 100 % saturated.
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