Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.16P
To determine
Check whether the compaction meets the specifications.
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Assuming the fill soil does not change properties, how can the compated soil density exceed 100% standard proctor?
a) Increased compaction energy
b)Increased Strength
c) Increased Plasticity Index
d) Decreased permeability
The results of a compaction test on samples of soil that 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. Sample No. Moisture Content Bulk Density (Ib/ft:) 4.8 7,5 145.0 3. 7.8 146.8 4 8.9 146.4 5 9.7 145.3
A 1 m thick soil with an initial void ratio of 0.94 was compacted by a roller and its thickness reduced by 0.09 m. The specific gravity of this soil is 2.65. A 178.0 g soil sample was collected from the compacted soil mass to examine the degree of compaction. The sample was dried in an oven for 24 hours and it had a dry mass of 142.4 g.
Determine the degree of saturation of the soil after the compaction.
Chapter 5 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The results of compaction test in the laboratory using the standard proctor method for the Ayer Hitam residual soil are tabulated in Table Q1(c). After compaction of the soil in the laboratory, the field density tests using the sand cone replacement method were performed. Assume the specific gravity, Gs = 2.65. (i) Determine the maximum dry density and optimum moisture content from compaction curve. (ii) Ayer Hitam residual soil will be used as a compacted layer with thickness of 4 m high. If the moisture content of the compacted soil at the field is 15.8%, determine the vertical stress (kN/m³) at a depth of 2.5 m from the ground surface.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_forwardA sand cone test has been performed in a recently compacted fill. The test results obtained are as shown in Table 3(b). (i) Determine the dry density of compaction in the field (ii) Calculate the maximum dry density from standard Proctor test if the relative compaction is 90%. (iii) Determine the degree of saturation of the compacted fill if the specific gravity of the soil is 2.65.arrow_forward
- 3. The following table lists the results of a standard Proctor assay. Determine the maximum dry compaction density and the optimum moisture content. Also obtain the void ratio and degree of saturation for optimum moisture content. Assume Gs = 2.68.arrow_forwardThe 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 imagearrow_forwardA 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_forward
- A 1972 kg/mᶟ wet unit weight and 5.5% average actual moisture content were obtained from a laboratory data during the conduct of FDT on an aggregate base coarse materials, what is the dry unit weight of the soil? From the above laboratory data and the obtained dry unit weight of soil, What will be the degree of compaction of the compacted materials when a 1960 kg/mᶟ maximum dry density is used as a reference Laboratory compaction data?arrow_forwardAn in-situ (subgrade) soil located in Colorado (TMI = -20) has the following index properties: Percent passing No.200 = 25 percent Plasticity Index = 20 Compaction tests indicate this soil has an optimum degree of saturation of 85 and a maximum dry unit weight of 100 PCF. The resilient modulus at optimum conditions is 10,000 psi. Estimate the resilient modulus at equilibrium with the environment for this soil. Clearly outline the steps followed and assumptions used to find the answer.arrow_forwardResults of a standard proctor ompaction test on a silty sand are shown. PLEASE COMPLETE SOLUTION. 1) Find the maximum dry unit weight and optimum moisture content. 2) What is the moist unit weight at optimum moisture content? 3) What is the degree of saturation at optimum moisture content? Given: ?? = 2.69 4) If the required field dry unit weight is 18.5 ??/?3, what is the relative compaction? 5) What should be the range of compaction moisture contents in the field to achieve the above relative compaction? 6) If the minimum and maximum void ratios are 0.31 and 0.82, respectively, what is the relative density of compaction in the field?arrow_forward
- A saturated 100 cm3 clay sample has a natural water content of 30%. It is found that the shrinkage limit occurs when the water content is 19%. If the specific gravity of soil is 2.70, compute: A. The shrinkage ratio B. The volume of sample when the water content is 15% C. The mass of dry soil samplearrow_forwardDetermine the maximum dry unit weight of compaction Determine the optimum moisture content Determine the void ratio at the optimum moisture content. Gs = 2.70 Determine the degree of saturation at the optimum moisture content A field unit determination test for the soil, yielded the following data. Moisture content = 12% and moist unit weight = 106 lb/cu.ft. Determine the relative compaction.arrow_forwardA field unit determination test for the soil, yielded the following data. Moisture content = 12% and moist unit weight = 106 lb/cu.ft. Determine the relative compaction.arrow_forward
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