cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 Two determinations for the plastic limit gave water contents of 22.8% and 23.2%. Determine (a) the liquid limit and plastic limit, (b) the plasticity index, (c) the liquidity index if the natural water content is 38% and (d) the void ratio at the liquid limit if G, = 2.7. (e) What is the soil state in the field? (f) Do you expect a brittle type of failure for this soil?
cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 Two determinations for the plastic limit gave water contents of 22.8% and 23.2%. Determine (a) the liquid limit and plastic limit, (b) the plasticity index, (c) the liquidity index if the natural water content is 38% and (d) the void ratio at the liquid limit if G, = 2.7. (e) What is the soil state in the field? (f) Do you expect a brittle type of failure for this soil?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q1
The following results were obtained from a liquid limit test on a clay using the Casagrande
cup device.
Number of blows
6
12
20
28
32
Water content (%)
52.5
47.1
43.2
38.6
37.0
Two determinations for the plastic limit gave water contents of 22.8% and 23.2%.
Determine (a) the liquid limit and plastic limit, (b) the plasticity index, (c) the liquidity
index if the natural water content is 38% and (d) the void ratio at the liquid limit if G, =
2.7. (e) What is the soil state in the field? (f) Do you expect a brittle type of failure for
this soil?
Q2
A fall cone test was carried out on a soil to determine its Atterberg limits using a cone of
mass 80 g. The following results were obtained.
Penetration (mm)
Water content (%)
8
15
19
28
43.1
52.0
56.1
62.9
Determine (a) the liquid and plastic limits and (b) the plasticity index. (c) If the soil
contains 45% clay, calculate the activity. (d) What is the predominant mineral in this soil?
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