What is Group index? What is the data required for finding Group index

1.	What is Group index? What is the data required for finding Group index of a soil?
Answer» It represents the performance of soil used in the construction of highways & roadways. Greater the value of Group Index poor will be the QUALITY of soil . It consider the following parameters in determining the value of GI. 1.particles size 2.liquid limit 3.plasticity Index GI=0.2a+0.005ac+0.01bd a= Particle passing 75µ greater than 35% but not EXCEEDING 75%( value lies between 0-40) b=particle passing 75µ greater than 15% but not exceeding 55%(0-40) c=value of liquid limit greater than 40% but not exceeding 60%(0-20) d= value of plasticity index greater than 10% but not exceeding 30%(0-20) . The minimum value of group index is zero & maximum value is 20 . GI value Quality . 0-2. good . 2-5. fair . 5-10. poor . 10-20. very poor

What is Group index? What is the data required for finding Group index of a soil?

Answer»

It represents the performance of soil used in the construction of highways & roadways.

Greater the value of Group Index poor will be the QUALITY of soil .

It consider the following parameters in determining the value of GI.

1.particles size

2.liquid limit

3.plasticity Index

GI=0.2a+0.005ac+0.01bd

a= Particle passing 75µ greater than 35% but not EXCEEDING 75%( value lies between 0-40)

b=particle passing 75µ greater than 15% but not exceeding 55%(0-40)

c=value of liquid limit greater than 40% but not exceeding 60%(0-20)

d= value of plasticity index greater than 10% but not exceeding 30%(0-20)

. The minimum value of group index is zero & maximum value is 20

. GI value Quality

. 0-2. good

. 2-5. fair

. 5-10. poor

. 10-20. very poor

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