I understand how water content helps compaction, by being kind of a lubricant between the soil particles, that helps them slide into position. But I don´t really understand how it starts affecting negatively after surpassing the optimum water content, but not surpassing the void volume, meaning is not occupying space that soil could. Is it because when there is too much water in the voids, that space occupied by water could be used by fine particles, therefore increasing dry density? Also I'm confused with it decreasing after optimum water content, since what I've seen is that the optimum water content also is dependent of the compaction energy.
Braja Das, Principles of Geo-technical Engineering.
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