Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.2P
To determine
Find how much water should be added to raise the moisture content to 16.0%.
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Soil Compaction
Homework: the results of standard compaction test are shown in the table below.
Determine the maximum dry unit weight and the optimum moisture content.
W%
6.2
8.1
9.8
11.5
12.3
13.2
ybkN/m³
18.7
20.4
16.9
19.5
20.5
20.1
а.
What is the dry unit weight and w at 95% standard compaction?
b. Determine the degree of saturation at the maximum yd , Gs = 2.7?
С.
Plot the zero air voids line?
Q7: The Table 4 shows the results of a Standard Proctor Compaction test.
Satisfactory
Y
Based on the information provided, determine the following values.
The maximum dry unit weight and the OMC.
The degree of saturation at the maximum dry density if Gs = 2.70.
What is the dry unit weight and the moisture range at 95% relative compaction
(RC)?
The degree of saturation at the maximum dry density if Gs = 2.70.
Table 4: Results of a standard Proctor compaction test
Trial No.
1
4
13.2
Moisture content, w (%)
6.2
8.1
9.8
11.5
12.3
20.1
Bulk unit weight (kN/m³)
16.9
18.7
19.5
20.5
20.4
17.8
Dry unit weight (kN/m³)
15.9
17.3
17.8
18.4
18.2
The following are results from the liquid and plastic limit
test for a soil.
No. of blows (N)
Moisture content (%)
15
42
20
40.8
28
39.1
The plastic limit is 18.7%.
1. Compute the liquid limit using table.
2. What is the plasticity index of the soil.
3. What is the liquidity index if the water content is 24%.
4. What is the consistency index.
Chapter 5 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Refer to the soil in Problem 4.5. Using the Casagrande plasticity chart, graphically estimate the shrinkage limit of the soil as shown in Figure 4.22. 4.5 The following data were obtained by conducting liquid limit and plastic limit tests on a soil collected from the site. Liquid limit tests: Plastic limit test: PL = 19.3% a. Draw the flow curve and determine the liquid limit. b. Using the Casagrande plasticity chart (Figure 4.21), determine the soil type.arrow_forwardA standard compaction test was performed in the laboratory and the results are tabulated as follows: 3 4 Trial Number 1 2 Moist Unit Weight (Ib/ft) 120.2 128.4 134.2 134.4 130.9 Moisture Content (%) 7.1 10.0 13.4 16.7 20.1 Determine the soil's optimum moisture content (%) LOarrow_forwardA standard compaction test was performed in the laboratory and the results are tabulated as follows: Trial Number 1 2 3 4 5 Moist Unit Weight (Ib/ft) 120.2 128.4 134.2 134.4 130.9 Moisture Content (%) 7.1 10.0 13.4 16.7 20.1 Determine the soil's maximum dry unit weight (drawing a plot may prove useful)arrow_forward
- Let us assume that a soil sample taken in the field is taken and it must be identified by the SUCS Method and AASHTO Method. Moisture content = 5.75% Limit liquid = 53.5 Plastic limit = 31.6 Granulometry Sieve % Pass No. 4 100 # 40 68 # 200 54.3 Do you select the best answer? a) Inorganic silt and sand, with low plasticity b) Inorganic clay with low plasticity c) Clay silt, traces of gravel, dark Brownarrow_forward2) A moist sample was found to have a volume of 22.3 cubic centimeters and to weigh 29.7 grams. The dry weight of the sample was determined to be 23 grams. Take the specific gravity of the soil solids to be 2.70. Determine the following: a) void ratio b) water content, % c) porosity,% d) degree of saturation of the sample, %arrow_forwardA modified proctor compaction test is performed on a sample of silty sand in a 150 mm diameter mold. The maximum dry unit weight is 19.6 kN/m3 and optimum water content is 11%. If the specific gravity solids is 2.65, draw the three-phase diagram of the sample in the mold and calculate all volumes and weight for that sample. What is the degree of saturation?arrow_forward
- A Liquid Limit test was carried out on a sample of Clay with the following results: Number of taps 6. 12 26 28 31 Moisture Content 53.4 52.2 48.3 40.0 38.8 37.1 (%6) The results from the Plastic Limit test gave the Plastic Limit of 28%. Determine: a) the Liquid Limit b) the Plasticity Index of the soil c) and Classify the soilarrow_forwardHomework #3 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: mold volume =943.3 cm'. b. Determine the void ratio and the degree of saturation at the optimum moisture content. Given: G, = 2.68. Trial no. Weight of moist soil in the mold (kg) Moisture content (%) 1.78 5.0 1.87 7.5 3 1.95 10.0 4 1.98 12.5 5 2.02 1.97 15 17.5 7 1.90 20.0arrow_forwardA compaction test was performed on a soil sample from a proposed cut area. The maximum dry unit weight and optimum moisture content were determined to be 104.8 lb/ft3 and 20.7% respectively. What is the possible type or classification of soil for this sample?arrow_forward
- 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)arrow_forward2. The results of a standard Proctor test are given in Table Q2 below. Determine the maximum dry unit weight of compaction and the optimum moisture content. Table Q2 Volume of Proctor Mass of wet soil in the mold Moisture content mold (cm³) (kg) (%) 1000 1.78 5.0 1000 1.87 7.5 1000 1.95 10.0 1000 1.98 12.5 1000 2.02 15.0 1000 1.97 17.5 1000 1.91 20.0arrow_forward6. Following is the result of 8 trials of a standard proctor test. Determine the optimum water content and maximum dry unit weight. Determine also the amount of energy expended in the compaction of one of the trials assuming that the test done is standard proctor test. Proctor Mold Volume Mass of wet soil in the Moisture Content Trial (cm³) mold (kG) (%) 943.3 1.68 9.9 2 943.3 1.71 10.6 3 943.3 1.77 12.1 943.3 1.83 13.8 943.3 1.86 15.1 6. 943.3 1.88 17.4 7 943.3 1.87 19.4 943.3 1.85 21.2arrow_forward
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