The traffic volume counts to be carried and
the strength of the subgrade soil are used to design the
different levels of pavement that must be placed over it.
The strength of the subgrade is commonly expressed as a
ratio known as the California Bearing Ratio,
abbreviated as CBR. When the subgrade is weaker,
thicker layers are required, whereas when the subgrade
is stronger, thinner layers are sufficient. When we can
understand how the strength of these soils is affected by
variations in saturation, it will be much easier to design
and maintain stronger structures. CBR resistance values
for soils utilized in the subgrademay vary to a greater
extent due to the saturation of the subgrade. Hence,
throughout this study,variation in the soaking degreehas
been tried and in turn the saturation level in twosoiltypes
and engineering properties of soils and CBR at different
levels of saturation are studied. The engineering
properties that wereevaluated after the soaking of three
days were worst and consideringfine-grained soils, it is
found to be same after the end of day 4.
Keywords : Compaction, CBR (California Bearing Ratio), subgrade, saturation levels.