Group Index of Soil in Highway construction
Group Index of Soil in Highway construction
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- Group Index(G.I) of soil is used to classify the fine grained soils and for checking their suitability as highway subgrade material.
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- 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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- Intelligent transportation systems (ITS)
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- Advanced Road Transportation System
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- The generation and safe use of hydrogen as a road vehicle secondary fuel
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- Intelligent transportation system
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- Transportation planning and modeling: trip generation & trip distribution
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- Application of high-speed trains to existing rail routes
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- Open channel hydraulics
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- Online Traffic Camera
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