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MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
9th Edition
ISBN: 9781305971264
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Question
Chapter 6, Problem 6.8P
(a)
To determine
The maximum dry density of compaction and the optimum moisture content.
(b)
To determine
The field dry density and range of acceptable moisture content.
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The detailed results of a standard Proctor test on a soil
classified as CL-ML and group name silty clay with sand are
shown in the table below. Determine the maximum dry unit
.weight and optimum water content
.Diameter of mould = 4 in
Height of mould = 4.584 in
.Volume of mould 1/30 ft3
.Weight of mould, M = 4.45 lb
Unit weight data
Water content data
Mass of can and
Weight of wet soil
and mold (Ibs)
Mass of can
(grams)
Mass of can and
wet soil (grams)
dry soil (grams)
M
M..
M.
M.
111.48
155.08
7.32
114.92
46.50
163.12
190.43
193.13
7.57
46.43
7.68
7.74
178.64
46.20
178.24
46.50
7.65
188.77
171.58
46.10
A given soil sample is taken from the field by Bubba Lesh for
compaction testing. Before
compaction, he finds the void ratio, degree of saturation and
moisture content.
Then, Bubba Lesh compacts the soil sample through a
modified proctor test. No water is added.
Explain how the following values change from the
uncompacted case to the compacted case
(increases, decreases, or remains the same) and a statement
describing why:
a) Void Ratio (10)
b) Degree of Saturation (10)
c) Moisture Content (10)
1. The results of a standard Proctor test are given in the following table.
a. Determine the maximum dry unit weight of compaction and the optimum moisture content,
given that the Proctor mold volume is 1/30 ft³.
b. Determine the void ratio and the degree of saturation at the optimum moisture content
given G₁= 2.68.
Trial no.
1234567
Weight of moist soil in the mold (lb)
3.92
4.12
4.29
4.37
4.45
4.35
4.20
Moisture content (%)
5.0
7.5
10.0
12.5.
15
17.5
20.0
Chapter 6 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
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- H.W The detailed results of a standard Proctor test on a soil classified as CL-ML and group name silty clay with sand are shown in the table below. Determine the maximum dry unit weight and optimum water content. Diameter of mould = 4 in. Height of mould = 4.584 in. Volume of mould = 1/30 ft3. Weight of mould. M = 4.45 lb. Unit weight data Water content data Weight of wet soil and mold (Ibs) Mass of can and dry soil (grams) Mass of can and Mass of can wet soil (grams) (grams) M. M. м. 7.32 114.92 111.48 155.08 46.50 7.57 163.12 46.43 7.68 190.43 178.64 46.20 46.50 7.74 193.13 178.24 7.65 188.77 171.58 46.10arrow_forwardA liquid limit test on a clay was performed with the following results. The natural water content of the clay is 38% and plastic limit is 21%. Number of Blows 6 12 20 28 32 Water content (%) 52.5 47.1 42.3 38.6 37.5 What is the plasticity index of this clay? (Use Interpolation) Group of answer choices 15.74% 18.99% 18.85% 17.63% Please answer this asap for upvote. thanksarrow_forwardA liquid limit test on a clay was performed with the following results. The natural water content of the clay is 38% and plastic limit is 21%. Number of Blows 6 12 20 28 32 Water content (%) 52.5 47.1 42.3 38.6 37.5 What is the liquidity index of this clay? (Use Interpolation) Group of answer choices 0.895 0.96 1.08 0.90 Please answer this asap. For upvote. Thanksarrow_forward
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