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 6.8P
(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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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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardIn an experiment, a soil is dug out from the ground, weighed, then oven dried, and then saturated with water. The weight of soil taken from the test hole is 1539 grams. The oven dried weight was 1163 grams. After saturating, it weighed 1632 grams. The volume of the test hole is found to be 1042cc. Determine the following: a. Void ratio. b. Specific gravity of the soil solids. c. Degree of saturation, %.arrow_forwardIn an experiment, a soil is dug out from the ground, weighed, then oven dried, and then saturated with water. The weight of soil taken from the test hole is 1539 grams. The oven dried weight was 1163 grams. After saturating, it weighed 1632 grams. The volume of the test hole is found to be 1042cc. Determine the following values: a. Void ratio. b. Specific gravity of the soil solids. c. Degree of saturation, %.arrow_forward
- A proctor compaction test was conducted on a soil sample, and the following observations weremade:Water content, percent 7.7 11.5 14.6 17.5 19.7 21.2Mass of wet soil, g 1739 1919 2081 2033 1986 1948 1. determine the wet density in g/cm32. determine the dry density in g/cm33. determine the dry unit weight in kN/m34. construct the compaction curve 5. determine the optimum moisture content in percent 6. determine the maximum dry density in kN/m37. construct the 80% and 100% saturation lines using w% = 8, 12, 16, 20, and 24 8. calculate the saturation for the maximum dry density (ϒdmax in kN/m3) and the optimummoisture content (wopt %)arrow_forwardIn a constant head permeability test, a soil sample is compacted into a round PVC pipe and placed into a tank as shown. After sufficient time is allowed for saturation of the soil, the test is conducted under standard temperature pressure conditions for 4 hours. A total of 227 g of water is decanted into a measuring vessel during the test. What is the coefficient of permeability of the soil?arrow_forwardDiaz (1992) reported the following values for Mexico City clay: void ratio (e) = 2, natural water content (w) = 460%, and specific gravity of solids (Gs) = 2.65. Please do the following: From the given values, and assuming Vs = 1 m³, compute all of the remaining quantities entering a phase diagram, i.e., Va, Vw, Ww, and Ws. Next, compute the degree of saturation (S). Finally, compute the moist unit weight (γ), dry unit weight (γd), and the unit weight of the solid phase (γs).arrow_forward
- A falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cm and its length or thickness is 6 cm. The diameter of the standpipe is 6.0 mm. The head at the start of the test is 58 cm. The test lasts 9 min and the head falls to 38 cm. Find the coefficient of permeability of this soil. The answer must be in 6 decimal places. Use units cm/sec.arrow_forwardDetermine the maximum dry unit weight of compaction Determine the optimum moisture content Determine the void ratio at the optimum moisture content. Gs = 2.70 Determine the degree of saturation at the optimum moisture content A field unit determination test for the soil, yielded the following data. Moisture content = 12% and moist unit weight = 106 lb/cu.ft. Determine the relative compaction.arrow_forwardAn undisturbed soil sample was prepared for a triaxial testing. The cylindrical soil sample is 50 mm in diameter and 100 mm long. It has a mass of 360 g. After finding the mass of the entire sample, a small portion was removed and a moisture content test was performed on it. The result of the moisture content test is shown in Table 3(a). Given the specific gravity, G, is 2.70. (i) Compute the moisture content (%) of the soil sample. (ii) By using the soil phase diagram, determine the bulk density (kg/m³), dry density (kg/m³), void ratio, porosity (%) and degree of saturation (%) of the soil sample.arrow_forward
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