Homework Answers
The dry density is on the y axis and water content on the x- axis.The optimum water content and maximum dry density correspond to the peak of the black curve here.So OMC is 15.5% and maximum dry density is 1.78 g/cm3. So option (b) is the correct answer. Why 1.78g/cm3 ? Because 1.78 KN/m3 is not in the normal range of dry density of soils.
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For the compaction curve shown below, the optimum water content and the maximum dry density are:...
For the data in Fig. 5.1: (a) Estimate the maximum dry density and optimum water content...
For the data in Fig. 5.1: (a) Estimate the maximum dry density and optimum water content for both the standard curve and the modified Proctor curve. (b) What is the placement water content range for 90% relative compaction for the modified Proctor curve and 95% relative compaction for the standard Proctor curve? (c) For both curves, estimate the maximum placement water content for the minimum compactive effort to achieve the percent relative compaction in part (b) Reference: Figure 5.1 2.0...
Compaction test Determine the degree of saturation and the air voids at maximum dry density. Discuss the reasons for t...
Compaction test
Determine the degree of saturation and the air voids at maximum dry density. Discuss the reasons for the shape of the graph of dry density versus water content Determine the compaction energy of the standard Proctor test. Discuss what effect would have on the maximum dry density and optimum water content, and the degree of saturation and air voids at maximum dry density if modified Proctor compaction test is conducted. . mass of wet sample 106.49 98.45 105.37...
1. (a) Briefly describe what is meant by the terms compaction and consolidation [5 marks] (b) In a standard B.S. compaction test, the following data was collected Moisture Content Bulk Density (Mg/m3...
1. (a) Briefly describe what is meant by the terms compaction and consolidation [5 marks] (b) In a standard B.S. compaction test, the following data was collected Moisture Content Bulk Density (Mg/m3) 1.87 2.04 2.13 2.20 2.16 2.09 $$5 8 10 13 16 19 Particle specific gravity 2.7 (i)Use a graph to find the maximum dry density and optimum moisture content of the soil shown above [10 marks] (ii) On the same graph, plot the zero and 5% air void...
Compaction 1. Why do we compact soils to 90 or 95% Standard Proctor (.e. maximum dry...
Compaction 1. Why do we compact soils to 90 or 95% Standard Proctor (.e. maximum dry unit weight) instead of 100% Standard Proctor? 2. At what saturation is the theoretical minimum void ratio achieved? 3. The following data were determined from a compaction test for a soil with a specific gravity of solids = 2.65 Water content Total Unit Weight (lb/ft) 10 98 106 119 125 128 124 119 (%) Graph the compaction curve (dry unit weight versus water content),...
1. In compaction tests, the following data were collected: Bulk density, p (Mg/m) 1.85 2.01 2.12...
1. In compaction tests, the following data were collected: Bulk density, p (Mg/m) 1.85 2.01 2.12 2.19 2.15 2.02 Water content, w (%) 11 14 17 19 a) Draw the graph of dry density against water content and draw the maximum dry density and the optimum moisture content. b) On the same axes, draw the 'zero air voids' line and 5 per cent air void line hence determine the air voids content at the maximum dry density. c) Under field...
The wet density at the maximum density is 120 pounds per cubic foot and optimum water...
The wet density at the maximum density is 120 pounds per cubic foot and optimum water content is 9%. The specific gravity is 2.81. The soil is to be compacted to a minimum of 90% of the maximum density. What dry density must the soil be compacted to in the field?
Two compaction tests, a standard Proctor test and a modified Proctor test, were performed on a...
Two compaction tests, a standard Proctor test and a modified Proctor test, were performed on a particular soil. Label which curve corresponds to which test. Label the maximum dry density and optimum water content for the higher curve. Derive an expression for the Zero Air Voids (ZAV) line shown in the figure below. The form of the line should be ya - f(w,Gs) ZAV (S-100%) Yd
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...
A series of Proctor compaction tests were performed on fill material used for a roadway application. The results are shown in the Table below.
A series of Proctor compaction tests were performed on fill material used for a roadway application. The results are shown in the Table below.Data Point No.12345Mass of compacted soil + mould (kg)3.7623.9214.0344.0914.04Moisture content, w (%)4.57.510.112.916.4 The mass of the compaction mould was 2.031 kg. The mould volume was 1×10–3 m3.(a) Compute dry unit weight gd for each data point. (b) Draw the Proctor compaction curve of the soil, and determine the maximum dry unit weight gd max and optimum moisture content...
A soil sample has a gravity density of 22 kN / m3 and a water content...
A soil sample has a gravity density of 22 kN / m3 and a water content of 10%. What is the dry gravity density of the sample? If the dry density, wet density and grain density of a soil sample are 1.6 g / cm3, 1.84 g / cm3 and 2.56 g / cm3, respectively, what will be the porosity of the sample?
For the data in Fig. 5.1: (a) Estimate the maximum dry density and optimum water content for both the standard curve and the modified Proctor curve. (b) What is the placement water content range for 90% relative compaction for the modified Proctor curve and 95% relative compaction for the standard Proctor curve? (c) For both curves, estimate the maximum placement water content for the minimum compactive effort to achieve the percent relative compaction in part (b) Reference: Figure 5.1 2.0...
Compaction test
Determine the degree of saturation and the air voids at maximum dry density. Discuss the reasons for the shape of the graph of dry density versus water content Determine the compaction energy of the standard Proctor test. Discuss what effect would have on the maximum dry density and optimum water content, and the degree of saturation and air voids at maximum dry density if modified Proctor compaction test is conducted. . mass of wet sample 106.49 98.45 105.37...
1. (a) Briefly describe what is meant by the terms compaction and consolidation [5 marks] (b) In a standard B.S. compaction test, the following data was collected Moisture Content Bulk Density (Mg/m3) 1.87 2.04 2.13 2.20 2.16 2.09 $$5 8 10 13 16 19 Particle specific gravity 2.7 (i)Use a graph to find the maximum dry density and optimum moisture content of the soil shown above [10 marks] (ii) On the same graph, plot the zero and 5% air void...
Compaction 1. Why do we compact soils to 90 or 95% Standard Proctor (.e. maximum dry unit weight) instead of 100% Standard Proctor? 2. At what saturation is the theoretical minimum void ratio achieved? 3. The following data were determined from a compaction test for a soil with a specific gravity of solids = 2.65 Water content Total Unit Weight (lb/ft) 10 98 106 119 125 128 124 119 (%) Graph the compaction curve (dry unit weight versus water content),...
1. In compaction tests, the following data were collected: Bulk density, p (Mg/m) 1.85 2.01 2.12 2.19 2.15 2.02 Water content, w (%) 11 14 17 19 a) Draw the graph of dry density against water content and draw the maximum dry density and the optimum moisture content. b) On the same axes, draw the 'zero air voids' line and 5 per cent air void line hence determine the air voids content at the maximum dry density. c) Under field...
Two compaction tests, a standard Proctor test and a modified Proctor test, were performed on a particular soil. Label which curve corresponds to which test. Label the maximum dry density and optimum water content for the higher curve. Derive an expression for the Zero Air Voids (ZAV) line shown in the figure below. The form of the line should be ya - f(w,Gs) ZAV (S-100%) Yd
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...
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