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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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:
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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- A 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 plasticity index of this clay? (Use Interpolation) Group of answer choices 15.74% 18.99% 18.85% 17.63% Please answer this asap for upvote. thanksarrow_forward1. 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_forward
- A fine-grained soil has 60% clay with LL = 220%, PL = 45%, and a natural water content of 6%. A standard Proctor compaction test was carried out in the laboratory and the following data were recorded: Diameter of mold = 4 in. Height of mold = 4.584 in. Mass of mold = 4.27lbs Specific gravity, G, = 2.69 Unit weight determination Water content determination Weight of wet soil and mold (Ibs) Mass of can and Mass of can Mass of can wet soil (grams) dry soil (grams) (grams) 7.02 105.05 103.1 42.1 7.78 100.69 97.9 40.9 8.08 114.71 110.7 42.7 134.26 128.5 104.8 8.01 42.5 41.8 7.17 109.34 (a) Plot the dry unit weight-water content curve. (b) Determine the maximum dry unit weight and optimum water content. (c) If the desired compaction for a dam core in the field is a minimum of 90% of the standard roctor maximum dry unit weight, what values of dry unit weight and range of water content Quld you specify? The expansion potential of the soil is high. Explain the values you select. (d) What field…arrow_forwardThe results of a standard Proctor test are given in the following table. Given: Mold volume 1/30 ft' and Gs = 2.69. Determine the void ratio and the degree of saturation at the optimum moisture content. Weight of moist soil Moisture in the mold (lb) Trial no. content (%) 1 3.7 8.6 2 4.15 10.6 4.69 12.5 4 4.62 14.9 5 4.02 16.7 6. 3.63 18.3arrow_forwardThe following results were obtained from a liquid limit test on a soil using a liquid limit device. The in-situ water content of this clay is 38% and the plastic limit is 20%. (Note: show the semi-log graph for the determination of the LL) Determine the following: (a) Liquid Limit of the soil, (b) Plasticity Index of the soil, and (c) Liquidity Index of the soil (d) shrinkage limit using the plasticity chartarrow_forward
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