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Wednesday, March 25, 2015

4.INDEX PROPERTIES OF SOIL



Soil has following important index properties

      1.Density index / Relative density:

  Formulae for density index

                                       e- original Voids ratio of soil
        
       2.Flow Index:

Formulae for flow index of soil
                                             

                                     w1- water content Corresponding to n1 blows
                                     w2- water content Corresponding to n2 blows

       3.Plasticity Index:
                   The Difference netween liquid limit and plastic limit is called                                 plasticity index

Formulae for plasticity index


       4.Toughness Index:
                  The ratio of Plasticity index to Flow index is called Toughness index.
     
                         Toughness index formulae

       5.Consistency Index: ( Resistance to deformation)
                  The ratio of liquid limit(WL) minus water content(w) to that of                               plasticity index is called consistency index(PI)

                                        
Consistency index formulae




       6.Liquidity Index:
                    The ratio of water content(w) minus plastic limit(Wp)  to that of                              plasticity index is called Liquidity index(PI)
                                      
Formulae for liquidity index


      7.Activity :
                      
Activity of clay formulae


                                                   






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