e) If G, 2.70, what is the degree of saturation of the field sample? Gs = f) If the field sample was saturated at constant total volume (i.e., the air in the voids was replaced by water), what would be the resulting moisture content? g) It is desired to plot the zero-air-void curve. For this purpose, compute the zero-air-void unit weight associated with moisture contents of 20.0, 22.0 and 24.0%. Figure 1 shows the laboratory field compaction curve for a given soil. Specifications call for the compacted unit weight to be at least 95% of the Standard Proctor Maximum and within of the optimum moisture content. When a sample of the soil was excavated from the field, it had a volume of 57.6 in³. The sample weighed 4.00 pounds wet and 3.36 pounds dry. 108.0 Dry unit weight (pounds per cubic foot) 106.0 104.0 102.0 100.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Moisture content (%) Figure 1: Results of laboratory standard Proctor compaction test. Determine the following: a) The field moisture content. b) The compacted dry unit weight. c) The relative compaction. d) Does the soil meet specifications?

e) If G, 2.70, what is the degree of saturation of the field sample? Gs = f) If the field sample was saturated at constant total volume (i.e., the air in the voids was replaced by water), what would be the resulting moisture content? g) It is desired to plot the zero-air-void curve. For this purpose, compute the zero-air-void unit weight associated with moisture contents of 20.0, 22.0 and 24.0%. Figure 1 shows the laboratory field compaction curve for a given soil. Specifications call for the compacted unit weight to be at least 95% of the Standard Proctor Maximum and within of the optimum moisture content. When a sample of the soil was excavated from the field, it had a volume of 57.6 in³. The sample weighed 4.00 pounds wet and 3.36 pounds dry. 108.0 Dry unit weight (pounds per cubic foot) 106.0 104.0 102.0 100.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Moisture content (%) Figure 1: Results of laboratory standard Proctor compaction test. Determine the following: a) The field moisture content. b) The compacted dry unit weight. c) The relative compaction. d) Does the soil meet specifications?

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 5.7P

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Question 4 In a standard compaction test on a soil (grain specific gravity of 2.67) the following results were obtained: Water content (%) 12.8 Mass (g) 1890 14.5 2130 15.6 2200 16.8 2210 19.2 2160 The volume of the mould is 1000 cm (i) Determine the maximum dry density obtainable under standard test conditions and the water content at which this occurs. (ii) Using the above results, specify a detailed quality control plan for field compaction of a highway project.
The results of a standard Proctor test are given in the following table. Determine the maximum dry unit weight of compaction and the optimum moisture content. Also determine the moisture content required to achieve 95% of γd(max). Calculate and plot the 80% and 100% saturation lines.
The laboratory compaction test of a certain type of soil gives a max dry density of 1.486 gm/cu.cm with an optimum water content of 12.5%. The ff are the results of a field density test using sand code equipment: Volume of soil excavated from the hole= 0.001337 cu.m. Weight of wet soil from the hole- 2220 grams Weight of soil after oven drying= 1890 grams a. Determine the field unit weight of the soil in gm/cu.cm. b. Find the water content of soil. c. What is the relative compaction?
The Following results were obtained From a standard Compaction test on a Soil: Soil Mechanics The volume of Gs 2.7 Buls uint wight (ksu/m) 20.4 21, 28 21. 63 21.44 20.18 2o.48 11.2 12.9 14 16.3 18.8 20.5 Water content (%) * plot the dry density/water content curve and give the optimum miosture content and maximum dry densityof the soil oiw M p lot the Lines of Zero 5 % and 10% air Voids, Lines 不

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• Problem 4- A soil sample from a certain excavation has the following grain size characteristics; Sieve size (mm) 2.00 0.075 0.500 0.005 0.002 % Finer 100 80 64 35 20 The group index of the soil was 17 and has a plasticity index of 24. Determine the liquid limit of the soil. GI = (F-35) [0.2 +0.005(LL-40)] +0.01 (F-15) (P.I. - 10)
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A modified Proctor compaction test was carried out using a cylindrical moldwith a 1000 ml volume. Table 2 summarizes the results. a. Plot the compaction and ZAV curves (RD=2.75 and ρwater=1000 kg/m3)b. Determine the maximum dry density and the optimum moisture content Table 2 Moisture Content (%)Mass of WetSample (g)10.5 2033.211.8 2146.613.0 2203.514.9 2183.116.4 2147.617.6 2116.8
The laboratory compaction test of a certain type of soil gives a maximum dry density of 1.486 g/cm3 with an optimum moisture content of 12.5%. The following are the results of a field unit weight determination test using sand cone method. Volume of the soil excavated from the hole = 0.001337 m3 Weight of soil from the hole when wet = 2220 g Weight of soil when dry = 1890 g What is the in situ water content of the soil? O 17.46% O 19.21% O 15.55% O 14.12%
Laboratory compaction test results on a clayey silt are given in the following table:- Moisture content (%) Dry unit w3eight (kNm³) 14.80 8 17.45 18.52 11 18.9 12 18.6 14 16.9 Following are the results of a field unit weight determination test on the same soil with the sand cone method:- • Calibrated dry density of Ottawa sand = 1667 kg/m³ • Calibrated mass of Ottawa sand to fill the cone = 0.117 kg • Mass of jar + cone + sand (before use) = 5.99 kg • Mass of jar + cone + sand (after use) = 2.81 kg • Mass of moist soil from hole = 3.331 kg • Moisture content of moist soil = 11.6% Determine a. Dry unit weight of compaction in the field
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