![102] How the compaction change soil characteristics?](http://img.homeworklib.com/questions/0077e8c0-eada-11ea-b151-4d717cc59e08.png?x-oss-process=image/resize,w_560)
Homework Answers
Soil Compaction:
Soil Compaction is a process of air is displaced from the pores and between the Soil grains by stress application on Soil.
Soil Characteristics after Compaction:
· Compaction increases the density.
· Compaction reduces the rate of both drainage and infiltration of water.
· Compaction reduces the volume of air.
· Soil Compaction reduces the crop growth, yield and quality.
· Compaction increases the Strength of Soil.
· Compaction reduces the hydraulic Conductivity.
Earth soil is being delivered to an embankment at a rate of 2000 lcy/hr. The compaction...
Earth soil is being delivered to an embankment at a rate of 2000 lcy/hr. The compaction process is being done using rollers with a drum width of 4.16 ft. The recommended compacted lift height is 7 inches with 4 drum passes at a speed of 2 mph. With an assumption of 55 min/hour efficiency, determine the number of rollers required to provide the necessary compaction for the delivered soil. Assume that lifts are placed at 10-in thickness before compaction for...
standard Proctor compaction test conducted on a clay sample gave the following results Weight of wet soil in the mould...
standard Proctor compaction test conducted on a clay sample gave the following results Weight of wet soil in the mould (g) | 1765 1860 1924 1947 1928 1906 Moisture content (%) 13.1 14.9 16.8 18.9 21.1 23.2 If the volume of the sample mould is 944 cm3, Determine the maximum dry density and optimum moisture content of the clay Draw on the same graph 5% voids ratio line. Sketch the dry density-moisture content curve you expect from modified Proctor compaction...
Void ratio for a rate of compaction of 95.0% the soil solids have a specific gravity...
Void ratio for a rate of compaction of 95.0% the soil
solids have a specific gravity of 2.78.
Modified Proctor Test 130.0 125.0 120.0 Dry Unit Weight (pcf) 115.0 110.0 105.0 0.0 5.0 15.0 20.0 10.0 w (%)
Soil Mechanics Problem 2 (26 points) Results from a standard Proctor compaction test yield an Optimum...
Soil Mechanics
Problem 2 (26 points) Results from a standard Proctor compaction test yield an Optimum Moisture Content (OMC) of 12% and a maximum dry unit weight of 18.1 kN/m. Given this information, address the following questions. a) The soil was used to construct an embankment on a construction site. A sand cone test indicated that a layer of the compacted fill had a total unit weight of 19.8 kN/m3 and a moisture content of 11%. Specifications call for the...
An embankment is to be constructed using a sandy soil from a borrow pit. In a standard compaction test on a soil (grain specific gravity of 2.7) the following results were obtained: Water content...
An embankment is to be constructed using a sandy soil from a borrow pit. In a standard compaction test on a soil (grain specific gravity of 2.7) the following results were obtained: Water content (%) Y kN/m3 6.2 16.9 8.1 18.7 9.8 19.5 11.5 20.5 12.3 20.4 13.2 20.1 The volume of the mould is 1000 cm3 Determine the maximum dry density obtainable under standard test conditions and the water content at which this occurs Discuss the techniques of quality...
3. Modified Proctor compaction test results for a soil at a construction site indicated that the...
3. Modified Proctor compaction test results for a soil at a construction site indicated that the maximum dry density Ya = 120 lb/A’ at an optimum water content wopt = 9.0%. Assuming specific gravity of the mineral solids Ga=2.67, calculate: (a) the void ratio at the maximum dry density (b) the degree of saturation S at maximum dry density.
3. Modified Proctor compaction test results for a soil at a construction site indicated that the...
3. Modified Proctor compaction test results for a soil at a construction site indicated that the maximum dry density ya = 125 lb/ft at an optimum water content Wopt = 9.5%. Assuming specific gravity of the mineral solids G=2.65, calculate: (a) the void ratio at the maximum dry density (b) the degree of saturation Sat maximum dry density.
A compaction test was conducted in a soils laboratory, and the Standard Proctor compaction procedure (ASTM...
A compaction test was conducted in a soils laboratory, and the Standard Proctor compaction procedure (ASTM D 698) was used. The weight of a compacted soil specimen plus mold was determined to be 4200 g. The volume and weight of the mold were 1/30 ft and 2100 g, respectively. The water content of the specimen was 9.1%. The wet unit weight of the compacted specimen is ᎢbᎴ3 .
Question 13 of 20 1 Points After compaction, the wet (or total) density of a compacted...
Question 13 of 20 1 Points After compaction, the wet (or total) density of a compacted highway base is 120 pcf, and its dry density is 110 pcf. The soil report shows that the soil in the highway base has a maximum dry density of 125 pcf. What is the % compaction achieved? %Compaction Achieved Dry Density Achieved*100/Maximum Dry Density A. 96% OB. 88% OC. 104%
The following results were obtained from standard Proctor compaction tests. Test ID Mass of moist soil...
The following results were obtained from standard Proctor compaction tests. Test ID Mass of moist soil (kg) 1 1.633 Standard Proctor Test 2 . 1.841 1.907 1.822 1.756 Moisture Content Test 14 14 Mass of tin empty (g) Mass of tin + wet sample (g) Mass of tin + dry sample (g) 98 62 878280 (a) Calculate moisture content (w) and dry unit weight (ya) for standard Proctor compaction tests. Plot moisture content (w) vs. dry unit weight (yd). Given:...
standard Proctor compaction test conducted on a clay sample gave the following results Weight of wet soil in the mould (g) | 1765 1860 1924 1947 1928 1906 Moisture content (%) 13.1 14.9 16.8 18.9 21.1 23.2 If the volume of the sample mould is 944 cm3, Determine the maximum dry density and optimum moisture content of the clay Draw on the same graph 5% voids ratio line. Sketch the dry density-moisture content curve you expect from modified Proctor compaction...
Void ratio for a rate of compaction of 95.0% the soil
solids have a specific gravity of 2.78.
Modified Proctor Test 130.0 125.0 120.0 Dry Unit Weight (pcf) 115.0 110.0 105.0 0.0 5.0 15.0 20.0 10.0 w (%)
Soil Mechanics
Problem 2 (26 points) Results from a standard Proctor compaction test yield an Optimum Moisture Content (OMC) of 12% and a maximum dry unit weight of 18.1 kN/m. Given this information, address the following questions. a) The soil was used to construct an embankment on a construction site. A sand cone test indicated that a layer of the compacted fill had a total unit weight of 19.8 kN/m3 and a moisture content of 11%. Specifications call for the...
3. Modified Proctor compaction test results for a soil at a construction site indicated that the maximum dry density Ya = 120 lb/A’ at an optimum water content wopt = 9.0%. Assuming specific gravity of the mineral solids Ga=2.67, calculate: (a) the void ratio at the maximum dry density (b) the degree of saturation S at maximum dry density.
3. Modified Proctor compaction test results for a soil at a construction site indicated that the maximum dry density ya = 125 lb/ft at an optimum water content Wopt = 9.5%. Assuming specific gravity of the mineral solids G=2.65, calculate: (a) the void ratio at the maximum dry density (b) the degree of saturation Sat maximum dry density.
A compaction test was conducted in a soils laboratory, and the Standard Proctor compaction procedure (ASTM D 698) was used. The weight of a compacted soil specimen plus mold was determined to be 4200 g. The volume and weight of the mold were 1/30 ft and 2100 g, respectively. The water content of the specimen was 9.1%. The wet unit weight of the compacted specimen is ᎢbᎴ3 .
Question 13 of 20 1 Points After compaction, the wet (or total) density of a compacted highway base is 120 pcf, and its dry density is 110 pcf. The soil report shows that the soil in the highway base has a maximum dry density of 125 pcf. What is the % compaction achieved? %Compaction Achieved Dry Density Achieved*100/Maximum Dry Density A. 96% OB. 88% OC. 104%
The following results were obtained from standard Proctor compaction tests. Test ID Mass of moist soil (kg) 1 1.633 Standard Proctor Test 2 . 1.841 1.907 1.822 1.756 Moisture Content Test 14 14 Mass of tin empty (g) Mass of tin + wet sample (g) Mass of tin + dry sample (g) 98 62 878280 (a) Calculate moisture content (w) and dry unit weight (ya) for standard Proctor compaction tests. Plot moisture content (w) vs. dry unit weight (yd). Given:...
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