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MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
9th Edition
ISBN: 9781305971226
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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Students have asked these similar questions
a. 100 cm3 saturated sample of quartz sand is weighed, gravity drained, weighed, oven dried, and weighed again. The saturated, gravity-drained, and oven-dried weights are 130g, 110 g, and 105 g, respectively. Using these data, calculate the following quantities.
i. Dry bulk density
ii. Porosity
iii. Degree of saturation after gravity drainage
iv. Specific yield
b. Given that the soil sample in part (a) above has porosity of 35%.
i. Determine the void ratio of this soil.
ii. If 50% of the void space is filled with water, with the remaining 50% filled with air, determine the volumetric water content, θ.
iii. and the degree of saturation, S.
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
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)
Chapter 6 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
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