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

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

The document Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Topic wise GATE Past Year Papers for Civil Engineering.
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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 liquid limit is in the range of 35% to 50%. Hence intermediate compressible soil.

Q.2 The clay mineral primarily governing the swelling behavior of Black Cotton soil is    [2014 : 1 Mark, Set-II]
(a) Halloysite
(b) lllite
(c) Kaolinite
(d) Montmorillonite
Ans.
(D)

Q.3 As per Indian Standard Soil Classification System (IS 1498 : 1970), an expression for A-line is    [2014 : 1 Mark, Set-II]
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Ans. 
(A)

Q.4 As per the Indian Standard soil classification system, a sample of silty clay with 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 | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

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, FMand FMR, it can be stated that    [2011 : 1 Mark]
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Ans. 
(A)
Solution:
The term fineness modulus is used to indicate an index number which roughly proportional to average size of particle in entire quantity of aggregate.
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev

Q.6 A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represented by the letter symbols    [2010 : 1 Mark]
(a) CL
(b) CI
(c) CH
(d) CL-ML
Ans.
(C)
Solution:
Plasticity index,
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Equation of A line is given by,
Classification of Soils and Clay Minerals Civil Engineering (CE) Notes | EduRev
Thus the given soil lies above the A-Line. The liquid limit of the soil is more than 50, hence the soil will be CH.

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