Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.7P
To determine
Find the relative compaction in the field.
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Laboratory compaction test results on a clayey soil are listed in the table below.
Moisture content (%) Dry unit weight (kN/m³)
6
14.80
8
17.45
9
18.52
11
18.9
12
18.5
14
16.9
The following are the results of a field unit weight determination test on the same soil with the sand cone method:
Calibrated dry density of Ottawa sand = 1,560 kg/m³
Calibrated mass of Ottawa sand to fill the cone = 0.565 kg
Mass of jar + cone + sand (before use) = 7.59 kg
Mass of jar + cone + sand (after use) = 4.78 kg
Mass of moist soil from hole = 2.85 kg
Moisture content of moist soil = 15.2%
Determine:
a. Dry unit weight of compaction in the field.
(Enter your answer to three significant figures.)
Ya =
]kN/m³
b. Relative compaction in the field.
(Enter your answer to two significant figures.)
R =
|%
A sample of field soil is tested in the laboratory. The results of Standard Proctor test at optimum
moisture content are given in the Table below: At the field, a sample of 552 cm' of this soil
weighted 1104 g. The weight of water in this sample was 184 g. Find the degree of compaction
(Relative compaction) at Standard Proctor test.
Table 1: Standard Proctor test data
Mass of wet soil in the mold(g)
Volume of proctor mold(cm°)
Optimum moisture content%
1656
828
12
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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
Chapter 5 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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