The field compaction of an earthwork was checked by an inspection engineer. In the laboratory test, the soilgives a maximum dry density of 1.523 gram/cc at optimum moisture content of 23.4%. Constructionspecifications require that the soil compacted dry density must be at least 95% of the maximum dry densityobtained from laboratory within +2%of optimum moisture content.The following data were obtained in the field using the sand cone test.Volume of soil excavated = 1425 cm3Weight of soil excavated = 2542 gramsDry weight of soil = 2068 gramsWhat is the in situ moisture content of the soil?O 21.41%O 22.92%O 23.56%O 24.56%

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Answered: The field compaction of an earthwork…

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 5.16P

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A soil sample was taken from a proposed cut area in a highway construction project and sent to a soils laboratory for a compaction test, using the Standard Proctor compaction procedure. Results of the test are as follows: Maximum dry unit weight = 112.6 lb/ft3 %3D Optimum moisture content = 15.5% The contractor, during construction of the soil em-bankment, achieved the following: Dry unit weight reached by field compaction = 107.1 Ib/ft3 Actual water content 16.0% %3D Determine the percent compaction achieved by the contractor.
A compaction test was conducted in a soils laboratory using the Standard Proctor Method B test procedure. The weight of the compact soil specimen plus mold and baseplate was determined to be 3841 g. The volume and mass of the mold were 943.7 cm³ and 2066.0 g, respectively. A moisture content test was carried out on a representative portion of the sample and the results were 9.8%. Required Determine the dry unit weight in metric units, to the nearest 100th. Your Answer:
A compaction test was conducted in a soils laboratory using the Standard Proctor Method B test procedure. The weight of the compact soil specimen plus mold and baseplate was determined to be 3889 g. The volume and mass of the mold were 943.8 cm³ and 2067.0 g, respectively. A moisture content test was carried out on a representative portion of the sample and the results were 10.4%. Required Determine the (wet) unit weight in metric units, to the nearest 100th. Your Answer:
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.
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.
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.
Liquid limit (LL) and plastic limit (PL) tests were carried out on a soil sample as per Indian Standard method. The values were 60% and 36% respectively for LL and PL. What is the type of soil based on the above test data as per Indian Standard Classification System? Explain the Classification.
(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%.
You are very disappointed that a compressibility experiment is no longer part of the CIE 334 laboratory curriculum. Taking matters into your own hands, you break into the soils lab over the weekend and obtain the following data. Assume the specific gravity of solids is 2.70. The initial height of the sample at zero stress was 22.5mm. The water content of the soil at the start of the test is 78%. Plot the e-log o' and e-log o' curves and calculate Cc. Effective Vertical Stress, o' (kPa) 20 50 100 200 400 800 Total Change in Height (mm) 0.23 0.87 1.90 3.62 5.55 7.25
4. Phase Diagram A soil sample was obtained at the underground parking garage that Dr. Barry is constructing at his home with a volume (VT) of 0.05 ft', total weight (WT) of 4.2 lbs, weight of water (Ww) of 0.37 lbs and a specific gravity (Gs) 2.70. Draw a complete phase diagram and determine the void ratio (e), moist unit weight (y), saturated unit weight (ysat), dry unit weight (Yary), weight of the solids (W.), volume occupied by the solids (V.), volume occupied by the water (V), volume occupied by the air (VA). volume of the voids (Vv), porosity (n), moisture content (w), and percent saturation (S). Use English units in your solution. Show all of your work.
A hydrometer test was conducted on the material passing sieve No, 200 and the results are listed in the table below, The results of sieve analysis on the soil showed that the percentage passing No. 4 was 90 % and that passing No. 200 was 20 %. Estimate the clay size fraction in the soil. Table : Results of hydrometer test diameter (mm) 0.0700 0.0400 0.0150 0.0020 % finer (combined) 19 finer 95 80 16 65 13 45 0.0010 30 6 Select one:
A permeability test is carried out on a sample of and cross section is 1500mm^ 2 a soil whose k = 3 * 10^(-1) m / s. Briefly identify this while indicating its degree of permeability What diameter of measuring pipe do we use knowing that the load goes from 275 mm to 200 mm in 5 min? Compare the permeability of this soil identified in question a) with that of a sandy silt. Justify your answer Compare the frost hardness of the soil identified in question a) with that of gradual sand. Between these two soils, which will be the most suitable as road fill without risk of frost swelling? Justify your answer

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