A modified Proctor compaction test was carried out on a clayey sand in a cylindrical mold that has a volume of 1000 ml. The specific gravity of the soil grains is 2.68. The moisture content and the mass of the six compacted specimens are given here. Moisture content (%) 5.0 7.0 9.5 11.8 14.1 17.0 Mass of specimen (g) 1850 1970 2090 2110 2090 2060 a. Plot the compaction test data and determine the optimum moisture content and the maximum dry unit weight. b. Plot the void ratio and the degree of saturation against the moisture content. c. What are the void ratio and degree of saturation at the optimum moisture content?

A modified Proctor compaction test was carried out on a clayey sand in a cylindrical mold that has a volume of 1000 ml. The specific gravity of the soil grains is 2.68. The moisture content and the mass of the six compacted specimens are given here. Moisture content (%) 5.0 7.0 9.5 11.8 14.1 17.0 Mass of specimen (g) 1850 1970 2090 2110 2090 2060 a. Plot the compaction test data and determine the optimum moisture content and the maximum dry unit weight. b. Plot the void ratio and the degree of saturation against the moisture content. c. What are the void ratio and degree of saturation at the optimum moisture content?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Compaction

Section: Chapter Questions

Problem 5.15P

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3- A series of standard Proctor compaction tests were performed on soil and the obtained results are presented in Figure below. The volume of the standard mould was 1 x 10³ m³ and Gs = 2.65. 1.82 1.80 1.78 1.76 What is the degree of saturation of the sample compacted to the maximum dry density? Estimate the volume of air (in m3) in the sample compacted to 15% water content. The void ratio of this soil in its loosest state is 1.74 1.72 1.70 1.68 1.66 0.623. Estimate the relative density of the soil sample compacted to 11% water content? 10 11 12 13 14 15 16 17 18 19 20 21 22 Water content (%) Dry density (g cm-3)
An in-place density determination (in-place unit weight) is made for the sand in a borrow pit using a balloon-type density apparatus. The damp sample dug from a test hole is found to weigh 37.90 N. The volume of the test hole is 0.00184m2. A. Compute the wet unit weight. B. This soil is to have a water content of 15%. Compute the dry unit weight of the soil. C. Compute the specific gravity of the soil if it has a void ratio of 0.423
3. A dry sand is placed in a container 9 cm3. The dry weight of the sample is 15 g. Water is carefully added to the container so as not to disturbed the condition of the Sample. When the container is filled the combined weight of soil and water is 18 g. Determine the following: a) Void ratio of sample in the container b) Porosity c) Water constant d) Specific gravity of the soil particle e) Saturated unit weight f) Dry unit weight
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A sample of silty sand in its natural conditions had a volume of 120cm3 and weighed 149g. After saturating the sample with water, it weighed 188g. The sample was then drained by gravity until it reached a constant weight of 133g. Finally the sample was oven dried for 2 days at 221 degrees fahrenheit after which it weighed 120 g. Note that the volume of the voids in the sample under natural conditions is the volume of water in the sample at saturation. Assuming that the density of water is 1 g/cc. Perform the following calculations: a) Water content on a mass basis under natural conditions b) Specificyield c) Specific retention d) Totalporevolume e) Porosity under natural conditions