GATE CE 2025 Set 1 — Question 18
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Geotechnical Engineering → Soil Classification → Indian Standard Classification
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Question
The standard plasticity chart for the classification of a fine-grained soil is shown in the figure. As per the Indian standard soil classification system, X represents
Correct answer
(C) inorganic clay with high plasticity
Solution
In the Indian Standard Soil Classification System (ISSCS), fine-grained soils are classified using the plasticity chart which plots the Plasticity Index () against the Liquid Limit ().
1.A-line: The A-line separates inorganic clays (above the A-line) from silts and organic soils (below the A-line). The equation for the A-line is .
2.Plasticity/Compressibility Classification: Based on the Liquid Limit ():
- : Low plasticity ()
- : Intermediate/Medium plasticity ()
- : High plasticity ()
- Above the A-line, which indicates it is an inorganic clay ().
- To the right of the vertical line at , which indicates high plasticity ().
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