From a standard Proctor laboratory sample of soil Gs= 2.70; maximum dry unit weight = 16.4 kN/m3; Optimum moisture content= 18%; Moisture content of soil at the borrow site+ 28%. Specification require that compaction of soil must be at least 95% of the maximum obtained from the proctor test. Compute the maximum compaction expected from the compacted soil using the zero air boids curve for this soil with the following moisture contents: w1= 20%; w2= 25%; w3= 30%. O a. 94.71% O b. 96.54% O. 92.07% O d. 90.12%

From a standard Proctor laboratory sample of soil Gs= 2.70; maximum dry unit weight = 16.4 kN/m3; Optimum moisture content= 18%; Moisture content of soil at the borrow site+ 28%. Specification require that compaction of soil must be at least 95% of the maximum obtained from the proctor test. Compute the maximum compaction expected from the compacted soil using the zero air boids curve for this soil with the following moisture contents: w1= 20%; w2= 25%; w3= 30%. O a. 94.71% O b. 96.54% O. 92.07% O d. 90.12%

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter6: Soil Compaction

Section: Chapter Questions

Problem 6.7P

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From a standard Proctor laboratory sample of soil Gs= 2.70; maximum dry unit weight = 16.4 kN/m3; Optimum moisture content= 18%; Moisture content of soil at the borrow site+ 28%. Specification require that compaction of soil must be at least 95% of the maximum obtained from the proctor test. Compute the maximum compaction expected from the compacted soil using the zero air boids curve for this soil with the following moisture contents: w1= 20%; w2= 25%; w3= 30%.
Determine 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.
The laboratory compaction test of a certain type of soil gives a maximum dry density of 1.486 g/cc' with an optimum moisture content of 12.5%. Determine the field unit weight of the soil in g/cc using the following results of a filed unit weight determination test using sand cone method. Volume of soil excavated from the hole = 0.001337 m³ Weight of moist soil from the hole = 2220 g Weight of oven dried soil = 1890 g Select one: a. 1.66 b. 1.58 C. 1.92 d. 1.87 It is the ratio of the volume of water to the volume of voids. Select one: a. Degree of saturation O b. Porosity c. Density d. Void ratio
1. (i) A dry soil has a void ratio of 0.65 and its grain specific gravity is = 2.80. What is its unit weight?(ii) Water is added to the sample so that its degree of saturation is 60% without any change in void ratio. Determine the water content and unit weight.(iii) The sample is next placed below water. Determine the true unit weight (not considering buoyancy) if the degree of saturation is 95% and 100% respectively. 2. A sample of saturated soil has a water content of 35%. The specific gravity of solids is 2.65. Determine its void ratio, porosity, saturated unit weight and dry unit weight 3. For a given soil, the void ratio e, water content w, and specific gravity Gs are found to be 0.50, 15%, and 2.65, respectively. Find: (a) Total unit weight of the soil γt (b) Degree of saturation S (c) Dry unit weight γd if the water in the void is removed 4. A shrinkage limit test for a saturated specimen had the initial volume Vi = 21.35 cm3 and initial weight Wi = 37 gf (…
The laboratory compaction test of a certain type of soil gives a maximum dry density of 1.486 g/cc3 with an optimum moisture content of 12.5%. Determine the relative compaction of the soil using the following results of a filed unit weight determination test using sand cone method. Volume of soil excavated from the hole = 0.001337 m3 Weight of moist soil from the hole = 2220 g Weight of oven dried soil = 1890 g Select one: a. 97.25 b. 95.10 c. 90.34 d. 88.41
A fine-grained soil has 60% clay with LL 220%, PL 545%, and a natural water content of 6%. A standard Proctor test was carried out in the laboratory and the following data were recorded Diameter of mold = 101.40 mmHeight of mold = 116.70 mmMass of mold = 4196.50 gram Specific gravity, Gs = 2.69 Determine the maximum dry unit weight and optimum water content. If the desired compaction in the field is 95% of the standard Proctor test results, what values of dry unit weight and water content would you specify? Explain why you select these values. What field equipment would you specify to compact the soil in the field, and why? How would you check that the specified dry unit weight and water content are achieved in the field?
(b) Table Q2(b)(i) shows the proctor compaction test results of bulk density andpercentage of water content conducted in geotechnic laboratory. The test isperformed on a subgrade soil sample with the specific gravity of solid is2.75. Based on the statement;(i) With the plot of graph, compute the maximum dry density andoptimum moisture content.(ii) Compute the range percentage of moisture content needed to achieve95% of relative compaction effort. (iii) Based on the answer in Q2(b)(ii), explain how the density of soil canbe improve if the compaction effort not achieve to 95%.
Subj: Soil Mechanics Specifications for a proposed earth fill require that a soil be compacted to 95% of Standard Proctor dry density. Tests on borrow material indicate maximum dry density equal to 124 lb/cu ft. at a optimum moisture content of 12% The borrow material in its natural condition has a void ratio of 0.60. Gs=2.65. Determine the relative compaction. a. 87.87% b. 83.48% c. 95.00% d. 92.76%
The laboratory compaction test of a certain type of soil gives a maximum dry density of 1.486 g/cc3 with an optimum moisture content of 12.5%. Determine the field unit weight of the soil in g/cc3 using the following results of a filed unit weight determination test using sand cone method. Volume of soil excavated from the hole = 0.001337 m3 Weight of moist soil from the hole = 2220 g Weight of oven dried soil = 1890 g
Can you help with part d below? A Proctor test was performed on a soil. For the water content and total wet density data below: a. Plot the moisture-dry density curve b. Find the maximum dry density and optimum moisture content c. Determine the moisture range permitted if a contractor must achieve 95% relative compaction d. What volume of water, in ft3, must be added to obtain 1 yd3 of soil at the maximum dry density if the soil is originally at 10% water content? Water Content Wet Density (%) (pcf) 10 100 13 110 16 122 18 127 20 130 22 128 25 119
Q2) A dry sample of soil having the following properties, L.L. = 52%, P.L. = 30%, Gs = 2.7, e = 0.53. Determine the following: 1- dry unit weight ,2-the porosity at plastic limit,
Table Q2(b)(i) shows the proctor compaction test results of bulk density andpercentage of water content conducted in geotechnic laboratory. The test isperformed on a subgrade soil sample with the specific gravity of solid is2.75. Based on the statement; (i) With the plot of graph, compute the maximum dry density andoptimum moisture content.