Explain optimum water content and maximum dry density. Show their relationship for typical soils
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Optimum Moisture Content is the water content at which the soil attains maximum dry density.
Maximum Dry Density is the dry density of soil corresponding to Optimum Moisture Content.
The relationship of Optimum Moisture Content and Maximum Dry Density for typical soils is:
W= Mass of water/ Mass of solids= Mw/ Ms
Pd= Mass of solids/ Total volume of soil= Ms/v
Pd= Ms/v . M/M = M/V . Ms/M
Pd= (M/V)/(Ms+Mw/Ms)
Pd= P/1+w