Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781337516877
Author: Das
Publisher: Cengage
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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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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. 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.
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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- 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 21.2arrow_forwardH.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 46.10arrow_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 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_forward
- A sample of field soil is tested in the laboratory. The results of Standard and Modified Proctor tests at optimum moisture content are given in the Table below: Standard Proctor test Modified Proctor test Mass of wet soil in the mold (g) 1800 2000 Volume of Proctor mold (cm?) 900 1000 Optimum moisture content (%) 12 10 At the field, a sample of 600 cm3 of this soil weighted 1200 g. The weight of water in this sample was 200 g. Find the following: 1- Degree of compaction (Relative compaction) (R%) at Standard Proctor test. 2- Degree of compaction (Relative compaction) (R%) at Modified Proctor test.arrow_forward(c) A sample of clay having a mass of 675 gm was coated with paraffin wax. The combined mass of the clay and the wax was found to be 682 gm. The volume was found by immersion in water as 345 ml. The sample was then broken to open. The water content and specific gravity of solids were found to be 15 % and 2.70 respectively. Calculate the bulk density of soil, its void ratio, and degree of saturation. Take specific gravity of wax as 0.89.arrow_forward6.Table 2 shows the results of the Standard Proctor Test TABLE 2 RESULTS OF ORI TEST Water Content (%) Weight (Kg) 14 1.45 16.5 1.71 18.5 1.87 20 1.88 21 1.76 22.5 1.67 If this test uses a sample mold with a size of 943 cm^3 , answer a few questions this: a. interpret the results of this proctor test, and determine the optimum moisture content and maximum dry density. (Gs = 2.7) b. Determine the range of moisture content for 90% compaction in the field c. Between soil A and soil B in Figure 1, which is easier to compact? Explain your answer.arrow_forward
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