As water is added to a soil at low moisture contents, it becomes easier for the particles to move past on the application of compacting force. The particles come closer , the voids are reduced and this causes the increase in density. As the water content increases, the soil particles develop larger water films around them.
This increase in dry density continues till a stage is reached where water starts occupying in the space that could have been occupied by the soil grains. Thus the water at this stage hinders the closer packing of grains and reduces the dry unit weight. The maximum dry density occurs at an optimum water content and their values can be obtain from the plot.
This increase in dry density continues till a stage is reached where water starts occupying in the space that could have been occupied by the soil grains. Thus the water at this stage hinders the closer packing of grains and reduces the dry unit weight. The maximum dry density occurs at an optimum water content and their values can be obtain from the plot.
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