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 6.9P
(a)
To determine
The dry unit weight of compaction in the field.
(b)
To determine
The relative compaction in the field.
(c)
To determine
Compare the relative compaction in the field with the required relative compaction.
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Problem 1:The results of a standard Proctor test are given in the following table. Given: Mold volume = 1/30 ft^3 and Gs = 2.69. Determine the void ratio and the degree of saturation at the optimum moisture content.
Trial #
Weight of moist soil in the mold (lb)
Moisture content (%)
1
3.7
8.6
2
4.15
10.6
3
4.69
12.5
4
4.62
14.9
5
4.02
16.7
6
3.63
18.3
Problem 2The laboratory test in Problem 1 is used to develop field compaction specification for a highway project. A field unit weight determination during the construction revealed that the in situ moist unit weight is 124 lb/ft3 and the moisture content is 13.7%. Determine the relative compaction in the field.
The results of a standard Proctor test are given in the following table. Determine the maximum dry density (kg/m3) of compaction and the optimum moisture content.
Volume of Proctor mold
(cm3)
Mass of wet soil in the mold
(kg)
Moisture content
(%)
943.3
943.3
943.3
943.3
943.3
943.3
943.3
943.3
1.6
1.71
1.77
1.83
1.86
1.88
1.87
1.85
9.9
10.6
12.1
13.8
15.1
17.4
19.4
21.2
b. A soil layer with a moisture content of 10 percent and a unit weight of 16.5 KN per cubic meter has a decrease in volume by 10 percent after compaction. Find the dry specific weight of the soil.
Please solve question (b) I have the answer of Question (a)if you need information please use the question a. given data:
a. The moisture content of the soil specimen is 20%, and the total weight is 300 gr. Calculate thevoid ratio and degree of saturation if the total volume was 180 cm3. (Gs = 2.5)
Chapter 6 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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