Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

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GATE : Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

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Q.1. A fine-grained soil is found to be plastic in the water content range of 26-48%. As per Indian Standard Classification System, the soil is classified as [2016: 1 Mark, Set-I]
(a) CL
(b) CH
(c) CL-ML
(d) CI

Ans. (d)
Solution: Soil is plastic in the range of 26-48%.
Hence, Plastic limit = 26% and liquid limit = 48%.
Because the liquid limit is in the range of 35% to 50%. Hence intermediate compressible soil.

Try yourself:The clay mineral primarily governing the swelling behavior of Black Cotton soil is [2014: 1 Mark, Set-II]
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Try yourself:As per Indian Standard Soil Classification System (IS 1498: 1970), an expression for A-line is [2014: 1 Mark, Set-II]
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Q.4. As per the Indian Standard soil classification system, a sample of silty clay with a liquid limit of 40% and plasticity index of 28% is classified as [2012: 1 Mark]
(a) CH
(b) CI
(c) CL
(d) CL-ML

Ans. (b)
Solution:
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRevIp of soil = 28%
Ip of A-line = 0.73(W- 20) = 0.73 (40 - 20) = 14.6
∵ Ip of soil > Ip of A-line
∴ It will lie above Aline and also 35 < W< 50
So it is CI.

Q.5. The results for sieve analysis carried out for three types of sand, P, Q, and R, are given in the adjoining figure. If the fineness modulus values of the three sands are given as FMP, FMQ, and FMR, it can be stated that [2011: 1 Mark]
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

(a) FM( FMx FM)
(b) FM= 0.5 ( FM+ FM)

(c) FMP > FMQ > FMR
(d) 
FM< FMQ < FMR
Ans. (a)
Solution: The term fineness modulus is used to indicate an index number roughly proportional to the average size of a particle in the entire quantity of aggregate.
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

Try yourself:A fine-grained soil has a liquid limit of 60 and a plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represented by the letter symbols [2010: 1 Mark]
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