Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 17, Problem 20P
To determine
The maximum dry unit weight of compaction and the optimum moisture content.
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A laboratory compaction test was performed on a soil sample taken from a proposed
cut area. The maximum dry unit weight and optimum moisture content were
determined to be 104.8 1b/ft 3 and 20.7%, respectively. Estimate the possible type
or classification of soil for this sample.
1) A-2-5 or A-2-6
2) A-4 or A-5
3) A-7-6 or A-6
4) A-1-a or A-1-b
The results of a compaction test on the sample of soil that are to be listed are to be used for an embankment on a highway project are listed below . Determine the maximum dry unit weight of compaction and the optimum moisture content. The table is shown in image
Standard proctor compaction test results on a sandy clay (35% sand, 55% clay, and 10% silt), taken from a borrow pit, are given in the following table.
The sandy clay in the borrow pit has a porosity of 65% and a water content of 5.2%. A highway embankment is to be constructed using this soil.
(a) Specify the compaction (dry unit weight and water content) to be achieved in the field. Justify your specification. (b) How many cubic meters of borrow pit soil are needed for 1 cubic meter of highway fill?
(c) How much water per unit volume is required to meet the specification?
(d) How many truckloads of soil will be required for a 100,000 m3 highway embankment? Each truck has a load capacity of 22.5 m3 and regulations required a maximum load capacity of 90%.
(e) Determine the cost for 100,000 m3 of compacted soil based on the following: Purchase and load borrow pit material at site, haul 2 km round-trip, and spread with 200 HP dozer = $15/m3; extra mileage charge for each km =…
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- A standard compaction test was performed in the laboratory and the results are tabulated as follows: Trial Number 1 2 3 4 5 Moist Unit Weight (Ib/ft) 120.2 128.4 134.2 134.4 130.9 Moisture Content (%) 7.1 10.0 13.4 16.7 20.1 Determine the soil's maximum dry unit weight (drawing a plot may prove useful)arrow_forwardA standard compaction test was performed in the laboratory and the results are tabulated as follows: 3 4 Trial Number 1 2 Moist Unit Weight (Ib/ft) 120.2 128.4 134.2 134.4 130.9 Moisture Content (%) 7.1 10.0 13.4 16.7 20.1 Determine the soil's optimum moisture content (%) LOarrow_forwardThe results of a Standard Compaction test are shown in the table below: Moisture Content Soil Unit Weight 6.2 8.1 12.3 96.8 19.5 11.5 13.2 16.9 18.7 20.5 20.4 20.1 Note: Add 0.01(last 2 digits of your ID number to the results above before solving. a. Determine the maximum dry unit weight and OMC. b. What is the dry unit weight and moisture range at 95 % relative compaction? c. Determine the degree of saturation at the maximum dry density if G, = 2.70.arrow_forward
- A compacted fill with a unit weight of 121 lb/ft^3 and a moisture content of 12.5% will be used for construction of a warehouse. Proctor compaction test was performed on a sample of the fill material. The test results revealed a maximum dry unit weight of 117 lb/ft^3 and an optimum moisture content of 13.0%. Compute the relative compaction based on the results of the Proctor compaction test.arrow_forwardResults of a standard Proctor compaction test on a silty sand are shown in the below figure. Dry unit weight (kN/m³) 19.5 19.0 18.5 18.0 6 17.5 17.0 5-17 7-12 8-11 a. What is the moist unit weight (ywet, kN/m3) at optimum moisture content? b. What is the degree of saturation (Sr, %) at optimum moisture content? Given: Gs = 2.73. c. If the required field dry unit weight (yd) is 18.15 kN/m3, what is the relative compaction (%)? 6. What should be the range of compaction moisture contents (%) in the field to achieve the above relative compaction? 10 0 6-14 5 9.5-10.5 10 Moisture content (%) 15 20 7. If the minimum and maximum void ratios are 0.29 and 0.80, respectively, what is the relative density of compaction in the field (%)?arrow_forwardThe results of a standard Proctor test are given in the following table. Determine the maximum dry density (kg/m3) of compaction and the optimum moisture content. Volume of Proctor mold (cm3) Mass of wet soil in the mold (kg) Moisture content (%) 943.3 943.3 943.3 943.3 943.3 943.3 943.3 943.3 1.6 1.71 1.77 1.83 1.86 1.88 1.87 1.85 9.9 10.6 12.1 13.8 15.1 17.4 19.4 21.2arrow_forward
- A compaction test was performed on a soil sample from a proposed cut area. The maximum dry unit weight and optimum moisture content were determined to be 104.8 lb/ft3 and 20.7% respectively. What is the possible type or classification of soil for this sample?arrow_forwardA modified Proctor compaction curve for a sandy fill has the following test data points. Dry Unit Weight (pcf) Water Content (%) 110 10 115 12 118 14 116 16 110 18 A sample of the compacted fill is collected from the field. It has a total unit weight of 118 pcf and is at a moisture content about 2% below the laboratory optimum. What is the relative compaction of the in-place fill?arrow_forwardDynamic loading, Vibro static test, Standard proctor and modified proctor are tests to determine soil compaction characteristics. O True O Falsearrow_forward
- Which compaction test will be preferred in the laboratory for determining the optimum moisture content (OMC) of soil to be used in the construction of subgrade for low-volume rural roads? a.Standard proctor test b.CBR test c.Marshall test d.Modified proctor testarrow_forward8. The results of a standard compaction test on a soil sample from Glasgow are shown in the graph below. From the graph, determine the optimum moisture content (OMC), maximum dry density and air content at maximum dry density. Can this soil be compacted to 2.11 Mg/m³ at OMC? Why? 22 0% 2.1 5% 2 10% 1.9 1.8 1.7 1.6 1.5 1.4 1.3 - 1.2 8 9 10 11 12 13 14 15 16 17 18 19 moisture content [%] 20 dry denslty [Mg/m³]arrow_forwardIt has been anticipated that the soil under the proposed dam is contaminated, and needs to be removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted on soil from a borrow pit, with the results shown below right. Based on the results: a) Plot the Proctor curve for the borrow soil. b) Find the optimum water content and max. dry unit weight for the borrow soil. c) Determine whether the unit weight of the top layer can be met by compacting to 95% of maximum, and what the range of moisture content for that unit weight is. d) If we borrow soil from a pit with a void ratio of 0.71, determine how much soil we need to borrow to backfill below the dam to match the in-situ void ratio of the top layer of soil.arrow_forward
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