7. The results of field unit weight determination of a soil sample using the sand cone method is as follows: Volume of soil: 0.001338 m³ Mass of soil: 2300 grams Dry mass of soil: 1910 grams In a laboratory, the soil yields a dry density of 1.495 g/cc at optimum moisture content of 20.8%. Specification requires that the compacted unit weight of the soil to be at least 95 % ± 2 %of the maximum laboratory value. a. What is the field unit weight of the soil in kN/m³? b. What is the in-situ water content of soil? c. What is the relative compaction of the soil, and did it comply with the specification? Yes or no

7. The results of field unit weight determination of a soil sample using the sand cone method is as follows: Volume of soil: 0.001338 m³ Mass of soil: 2300 grams Dry mass of soil: 1910 grams In a laboratory, the soil yields a dry density of 1.495 g/cc at optimum moisture content of 20.8%. Specification requires that the compacted unit weight of the soil to be at least 95 % ± 2 %of the maximum laboratory value. a. What is the field unit weight of the soil in kN/m³? b. What is the in-situ water content of soil? c. What is the relative compaction of the soil, and did it comply with the specification? Yes or no

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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10. The results of a Standard Proctoretest is tabulated as follows: (SEE PICTURE) 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 pcf. Determine the relative compaction.
The laboratory compaction test of a certain type of soil gives a maximum dry density of 1486 g/m3 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 soil excavated from the hole = 0.001337 m3 Weight of soil from the hole when wet = 2220 g Weight of soil from the hole when dried = 1890 g Determine the field unit weight of soil in g/cm3. Determine the relative compaction, then tell whether it is within the allowable range for relative compaction of 95 ± 0.20?
An 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.
You are checking a field-compacted layer of soil. The laboratory control curve has the following values: gd (kN/m3) w (%) 16.34 14 16.57 16 16.65 18 16.50 20 16.26 22 15.87 24 The specification for compaction states that the field-compacted soil must be at least 95% of the maximum control density and within of the optimum moisture for the control curve. You dig a hole 1m3 in the compacted layer and extract a sample that weighs 17.2 kN wet and 14.1 kN dry. (a) What is the compacted gd? The compaction w? The percent compaction? Does the sample meet the specifications? (b) If the specific gravity is 2.68, what is the compacted degree of saturation? If the sample were saturated at constant density, what would be the water content?
A sample of soil obtained from a borrow pit has a wet weight of 42 lb. The total volume occupied by the sample when in the ground was 0.34 ft3. A small portion of the sample is used to determine the water content. When wet, the sample mass is 150 g; after drying, 125 g. (a) What is the water content of the sample? (b) Determine the wet and the dry unit weights of the soil in the borrow pit.
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.
Following results are obtained for a liquid limit test using a fall cone device. Estimate the liquid limit of the soil and the flow index.
A soil sample has the following properties: Sp.gr. = 2.67, Void ratio = 0.54, Water content = 11.2%. Compute the air void ratio.
1: A sample of soil is obtained from a test pit is one cubic foot ( 1ft³) and weighs 140 lb. The entire sample is dried in an oven and found to weigh 125 lb. Calculate the following: A. water content(%) B. Moist Unit Weight (pcf) C. Dry Unit Weight (pcf)
The following data apply to a soil sample taken from a construction site: Specific gravity, Gs = 2.70 Void ratio, e = 0.80 For this soil, determine the dry density (kg/m3) and dry unit weight (in both kN/m3 and pcf).
A sample of the soil tested in triaxial with dimensions of 38 mm diameter and 76 mm height, its weight afterthe test was 205.1 g and after drying in an oven the weight was 175.6 g, determine the moisture content,bulk and dry densities and unit weights. 1- Analyse the results of liquid limit, plastic limit and plasticity indices determined 2- What is the importance of specific gravity, in the given examples?
An undisturbed soil obtained from a test pit 0.063 m3 in volume in found to have a wet weight of 0.94 kN. The dry weight of the sample is 0.76 kN. 1- Use the basic relationships of phase diagram representation of soil bulk to determine the wet density, dry density, dry unit weight, moisture content, void ratio, porosity, and the degree of saturation for a wet soil sample, 2- What would be the effective unit weight, in kN/m3, approximately and accurately, of such soil if it were submerged below the groundwater table ? The specific gravity of the soil is determined to be Gs = 2.65.