Group Index of Soil in Highway construction

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Group Index of Soil in Highway construction

    • Group Index(G.I) of soil is used to classify the fine grained soils and for checking their suitability as highway subgrade material.
    • It assigned a particular group to a soil. The quality of a subgrade soil is inversely proportional to G.I., means higher G.I indicates poorer quality of soil.

G.I = 0.2a + 0.005ac + 0.01bd

where,

a= portion of material passing 0.074mm sieve, greater than 35 and less than 75%. It is expressed as whole number from 0 to 40.

b= portion of material passing 0.074mm sieve, greater than 5 and less than 35%. It is expressed as whole number from 0 to 20.

c= value of liquid limit in excess of 40 and less than 60. It is expressed as whole number ranging from 0 to 20.

d= value of plasticity index exceeding 10 and less than 30. It is expressed as whole number ranging from 0 to 20.

GI values

  • 0-2. good
  • 2-5. fair
  • 5-10. poor
  • 10-20. very poor

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Arbaj Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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