Determine water contained in soil

For determined the water contained on the soil. Take soil in the container and weight it, after weighted suppose its weight is W1, ie the weight of solid and water (Ws+Ww). Then after that soil is put into oven for 24 hours at 110°C. After it dried again weight, after weighted let weight may be Ws. Then water contained in the soil can be determined by given formula:
         w= Ww/Ws ×100%
Where, Ww = Ws- (Ws+Ww)
It is also to be noted that weight of container suppose to be nearly zero.

Coefficient of uniformity and coefficient of curvature

#Coefficient of uniformity
The coefficient of uniformity is numerical value which determine the degree of uniformity. It is defined as the ratio of diameter of particle corresponding 60 % of fine to the ratio of diameter of particle 

History

HISTORY OF SOIL MECHANICS

Ancient to medieval period
In this period many constructions were constructing by thumbs rule. In this perid soil and soil mechanics were not introduced but there are many construction done in that period still exist.
● Egyptian used caissons for deep foundation in 2000 bc

Definition

The soil mechanics is the science which deals with the different properties of soil and the forces act on it.

Phase Diagram of soil

In the soil particle around the solid  you got
void in the soil. In that void sometimes air filled and sometimes water, also both of
water and air fill sometimes.
When only water filled in the void then there will two phase that is solid and water.
When only air filled then in that case also only two phase that is solid and air.
When both air and water filled then there will be three phase diagram ie solid, water, air.

Firstly, said that in the void water and air fill. From that concept if we have asked to find the volume of void then we can find it by considering the volume of water and volume of air, simply sum of volume of water Vw and Va.
        Volume of void (Vv) = Vw+Va        ----1
     Total volume (V) = Vw + Va + Vs      ----2
Where Vs stands for volume of solid in the soil.
Eqn 2 also can be written as
                    V = Vv + Vs ------3

As similiar way weight can be also find by using equation given below.

           Weight of void (Wv) = Ww + Wa ----1
      Weight of air nearly equal to zero ( Wa=0)
      Therefore, W= Ww ----2

Now total weight (W) = Ww + Ws  ----3