EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
9th Edition
ISBN: 8220103611718
Author: SOBHAN
Publisher: CENGAGE L
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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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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
46.10
A hydrometer test was conducted on the material passing sieve No, 200 and the results are listed in the table below, The results of sieve
analysis on the soil showed that the percentage passing No. 4 was 90 % and that passing No. 200 was 20 %. Estimate the clay size fraction in
the soil.
Table : Results of hydrometer test
diameter
(mm)
0.0700
0.0400
0.0150
0.0020
% finer
(combined)
19
finer
95
80
16
65
13
45
0.0010
30
6
Select one:
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
EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
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- 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 20.0arrow_forwardAn ASTM D 854 test was done on a sand. The data are shown below. Calculate the specific gravity. Mass of pychnometer = 46.1 grams Mass of pychnometer and dry soil = 67.4 grams Mass of pychnometer, dry soil and water = 157.7 grams Mass of pychnometer and water = 140.9 gramsarrow_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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