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You are hired as an earthwork construction control inspector, and you are checking the field compaction of a layer of soil. The laboratory compaction curve for the soil is shown below. Specifications call for the compacted density to be at least 95% of the maximum laboratory value and within +/- 2% of the optimum water content. When you did the sand cone test, the volume of soil excavated was 1153 cm³, weighing 2209 g wet and 1879 g dry. You also know the density of the soil solids: 2.64 Mg/m³. (A) Determine the compacted dry density. (Show all pertinent volume-weight relationships and calculations.) (B) Determine the field water content. (Show all pertinent volume-weight relationships and calculations.) (C) Determine the relative compaction. (Show all pertinent volume-weight relationships and calculations.) (D) Does the test meet the required specifications? (E) Determine the degree of saturation of the field sample. (Show all pertinent volume- weight relationships and calculations.) (F) If the sample were to become fully saturated at constant dry density (no change in total volume or void ratio), what would be the saturated water content? (Show all pertinent volume-weight relationships and calculations.) Pa (Mg/m³) 1.8 1.7H 1.6 1.5 1 1 1 12 L 14 1 1 16 w (%) I 18 1 1 20

You are hired as an earthwork construction control inspector, and you are checking the field compaction of a layer of soil. The laboratory compaction curve for the soil is shown below. Specifications call for the compacted density to be at least 95% of the maximum laboratory value and within +/- 2% of the optimum water content. When you did the sand cone test, the volume of soil excavated was 1153 cm³, weighing 2209 g wet and 1879 g dry. You also know the density of the soil solids: 2.64 Mg/m³. (A) Determine the compacted dry density. (Show all pertinent volume-weight relationships and calculations.) (B) Determine the field water content. (Show all pertinent volume-weight relationships and calculations.) (C) Determine the relative compaction. (Show all pertinent volume-weight relationships and calculations.) (D) Does the test meet the required specifications? (E) Determine the degree of saturation of the field sample. (Show all pertinent volume- weight relationships and calculations.) (F) If the sample were to become fully saturated at constant dry density (no change in total volume or void ratio), what would be the saturated water content? (Show all pertinent volume-weight relationships and calculations.) Pa (Mg/m³) 1.8 1.7H 1.6 1.5 1 1 1 12 L 14 1 1 16 w (%) I 18 1 1 20

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter5: Soil Compaction
Section: Chapter Questions
Problem 5.16P
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Subject is soil Mechanics
You are hired as an earthwork construction control inspector, and you are checking the field compaction of a layer of soil. The laboratory compaction curve for the soil is shown below. Specifications call for the compacted density to be at least 95% of the maximum laboratory value and within +/- 2% of the optimum water content. When you did the sand cone test, the volume of soil excavated was 1153 cm³, weighing 2209 g wet and 1879 g dry. You also know the density of the soil solids: 2.64 Mg/m³. (A) Determine the compacted dry density. (Show all pertinent volume-weight relationships and calculations.) (B) Determine the field water content. (Show all pertinent volume-weight relationships and calculations.) (C) Determine the relative compaction. (Show all pertinent volume-weight relationships and calculations.) (D) Does the test meet the required specifications? (E) Determine the degree of saturation of the field sample. (Show all pertinent volume- weight relationships and calculations.) (F) If the sample were to become fully saturated at constant dry density (no change in total volume or void ratio), what would be the saturated water content? (Show all pertinent volume-weight relationships and calculations.) Pa (Mg/m³) 1.8 1.7 1.6 1.5 1 12 1 14 I 16 w (%). 1 18 20
Transcribed Image Text:You are hired as an earthwork construction control inspector, and you are checking the field compaction of a layer of soil. The laboratory compaction curve for the soil is shown below. Specifications call for the compacted density to be at least 95% of the maximum laboratory value and within +/- 2% of the optimum water content. When you did the sand cone test, the volume of soil excavated was 1153 cm³, weighing 2209 g wet and 1879 g dry. You also know the density of the soil solids: 2.64 Mg/m³. (A) Determine the compacted dry density. (Show all pertinent volume-weight relationships and calculations.) (B) Determine the field water content. (Show all pertinent volume-weight relationships and calculations.) (C) Determine the relative compaction. (Show all pertinent volume-weight relationships and calculations.) (D) Does the test meet the required specifications? (E) Determine the degree of saturation of the field sample. (Show all pertinent volume- weight relationships and calculations.) (F) If the sample were to become fully saturated at constant dry density (no change in total volume or void ratio), what would be the saturated water content? (Show all pertinent volume-weight relationships and calculations.) Pa (Mg/m³) 1.8 1.7 1.6 1.5 1 12 1 14 I 16 w (%). 1 18 20
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