Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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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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PROBLEM 1
The results of a standard Proctor test are given in the following table.
Mass of moist
Moisture
soil in the
mold (kg)
Trial
Content (%)
1
1.47
10.0
2
1.83
12.5
3
2.02
15
1.95
17.5
5
1.73
20.0
1.69
22.5
After compaction the field unit weight of the soil is determined by means of the sand
cone method, the following are the results:
O Calibrated dry density of Ottawa sand = 1731 kg/m3
O Mass of Ottawa sand to fill the cone = 0.118 kg
O Mass of jar + cone + sand (before use) = 6.08 kg
O Mass of jar + cone + sand (after use)= 2.86 kg
O Mass of moist soil from the hole = 3.34 kg
O Moisture content of moist soil = 12.1%
%3D
Determine the maximum dry unit weight (kN/m3) of compaction and the optimum
moisture content. Given mold volume
943.3 cm3. Note: Check the maximum
dry unit weight of compaction and the optimum moisture content using the
graphical method and by means of the equation of the line.
b.
Determine the relative compaction in the field.
a.
Show your solution, formula and given
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
Principles of Geotechnical Engineering (MindTap Course List)
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