Soil Compaction 1. A series of Modified Proctor Tests have been perfomed on a soil that has a unit weight of 26,290.8 N/m³. The volume and mass of the empty mold are 1/30 ft and 1.970 kg, respectively. The test results obtained are as follows: Moisture Content Test Results Point No. Mass of Mass of Can Mass of Can+Moist Mass of Can + Compacted () Soil (g) Dry Soil (g) Soil+Mold (kg) 1 3.673 22.11 205.74 196.33 2 3.798 23.85 194.20 180.54 3 3.927 19.74 196.24 177.92 4 3.983 20.03 187.43 165.71 3.932 21.99 199.59 171.11 c. If the required relative compaction is 98% of MDD, the dry unit weight in the field should be greater than kN/m³.

Soil Compaction 1. A series of Modified Proctor Tests have been perfomed on a soil that has a unit weight of 26,290.8 N/m³. The volume and mass of the empty mold are 1/30 ft and 1.970 kg, respectively. The test results obtained are as follows: Moisture Content Test Results Point No. Mass of Mass of Can Mass of Can+Moist Mass of Can + Compacted () Soil (g) Dry Soil (g) Soil+Mold (kg) 1 3.673 22.11 205.74 196.33 2 3.798 23.85 194.20 180.54 3 3.927 19.74 196.24 177.92 4 3.983 20.03 187.43 165.71 3.932 21.99 199.59 171.11 c. If the required relative compaction is 98% of MDD, the dry unit weight in the field should be greater than kN/m³.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter4: Plasticity And Structure Of Soil

Section: Chapter Questions

Problem 4.12P

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A compaction test was conducted in the laboratory and the following information was obtained: • The weight of the compacted soil specimen (including the mold) was determined to be 3815 • The volume of the mold = 1/30 ft³ (944 cm³) • The weight of the mold = 2050 g • The water content in the soil was determined to be 9.1% Find the dry unit weight of the soil (in units of kN/m³).
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Solve a and b
PROBLEM 1 The results of a standard Proctor test are given in the following table. Mass of moist Moisture soil in the mold (kg) Trial Content (%) 1 1.47 10.0 2 1.83 12.5 3 2.02 15 1.95 17.5 5 1.73 20.0 1.69 22.5 After compaction the field unit weight of the soil is determined by means of the sand cone method, the following are the results: O Calibrated dry density of Ottawa sand = 1731 kg/m3 O Mass of Ottawa sand to fill the cone = 0.118 kg O Mass of jar + cone + sand (before use) = 6.08 kg O Mass of jar + cone + sand (after use)= 2.86 kg O Mass of moist soil from the hole = 3.34 kg O Moisture content of moist soil = 12.1% %3D Determine the maximum dry unit weight (kN/m3) of compaction and the optimum moisture content. Given mold volume 943.3 cm3. Note: Check the maximum dry unit weight of compaction and the optimum moisture content using the graphical method and by means of the equation of the line. b. Determine the relative compaction in the field. a.
Q2: A 0.01 m' of saturated soil sample has a unit weight of 1.6g/cm3. After it is dried in the oven, the weight of the soil sample reduced to 13.5kg. Use a phase diagram, determine the following: Weight of water for the saturated soil, Ww Water content, wc Ws WATER Void ratio, e Porosity, n SOLID befare trng W. Va SOLID efter ening
x=5 , y=6 , z=7
6.Table 2 shows the results of the Standard Proctor Test TABLE 2 RESULTS OF ORI TEST Water Content (%) Weight (Kg) 14 1.45 16.5 1.71 18.5 1.87 20 1.88 21 1.76 22.5 1.67 If this test uses a sample mold with a size of 943 cm^3 , answer a few questions this: a. interpret the results of this proctor test, and determine the optimum moisture content and maximum dry density. (Gs = 2.7) b. Determine the range of moisture content for 90% compaction in the field c. Between soil A and soil B in Figure 1, which is easier to compact? Explain your answer.
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Following is the result of a modified proctor test. Determine the maximum dry unit weight, void ratio and saturation at optimum moisture content and energy of compaction. Make a tabulation of all your results.
Question 8 A cylindrical specimen of a cohesive soil of 11 cm diameter and 22 cm length was prepared by compaction in a mold. If the wet mass of the specimen was 3.14 kg. and its water content was 17.01%. (Specific gravity of soil solids is 2.74). Determine the void ratio of the soil. Round off to three decimal places.