Problem 1. You have been tasked with the design and quality control of a soil placed behind a retaining wall (good drainage is desired). Laboratory compaction test results on the clayey soil used in the project are listed on the table below. Specific gravity of the soil = 2.85 Wet mass (kg) w (%) 9.50 1.85 1.87 10.20 1.94 11.90 2.00 13.40 2.04 14.70 2.06 17.00 2.03 2.00 19.10 20.90 a) ( What is the O.M.C. and the maximum dry unit weight for that soil? b) Based on your compaction curve, what specification for moisture content and dry unit weight will you give to the contractor? Why? (typically compaction specifications are provided within a small range, (i.e. compact to 18 to 18.3 kN/m^3 with moisture contents in the range of 9%-10%) As part of the quality control, you performed a sand-cone test on the compacted soil and obtained the following data: Density of the sand (kg/m^3)= 1500; Mass of sand to fill the cone = 0.524 kg Mass of jar+cone+sand (before use)= 6.98 kg Mass of jar+cone+sand (after use)= 5.84 kg Mass of moist soil from hole = 0.87 kg c) Moisture content of soil = 0.14 What is the dry unit weight of the compacted soil? e) Based on your results from the sand-cone test, does the field compaction meet the specifications? (if not, the contractor must redo the work).
Problem 1. You have been tasked with the design and quality control of a soil placed behind a retaining wall (good drainage is desired). Laboratory compaction test results on the clayey soil used in the project are listed on the table below. Specific gravity of the soil = 2.85 Wet mass (kg) w (%) 9.50 1.85 1.87 10.20 1.94 11.90 2.00 13.40 2.04 14.70 2.06 17.00 2.03 2.00 19.10 20.90 a) ( What is the O.M.C. and the maximum dry unit weight for that soil? b) Based on your compaction curve, what specification for moisture content and dry unit weight will you give to the contractor? Why? (typically compaction specifications are provided within a small range, (i.e. compact to 18 to 18.3 kN/m^3 with moisture contents in the range of 9%-10%) As part of the quality control, you performed a sand-cone test on the compacted soil and obtained the following data: Density of the sand (kg/m^3)= 1500; Mass of sand to fill the cone = 0.524 kg Mass of jar+cone+sand (before use)= 6.98 kg Mass of jar+cone+sand (after use)= 5.84 kg Mass of moist soil from hole = 0.87 kg c) Moisture content of soil = 0.14 What is the dry unit weight of the compacted soil? e) Based on your results from the sand-cone test, does the field compaction meet the specifications? (if not, the contractor must redo the work).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem 1. You have been tasked with the design and quality control of a soil placed behind a retaining wall (good drainage is desired).
Laboratory compaction test results on the clayey soil used in the project are listed on the table below. Specific gravity of the soil = 2.85
Wet mass
(kg)
w (%)
1.85
9.50
1.87
10.20
11.90
13.40
14.70
1.94
2.00
2.04
2.06
17.00
2.03
19.10
2.00
20.90
a)
( What is the O.M.C. and the maximum dry unit weight for that soil?
b) Based on your compaction curve, what specification for moisture content and dry unit weight will you give to the contractor? Why?
(typically compaction specifications are provided within a small range, (i.e. compact to 18 to 18.3 kN/m^3 with moisture contents in the
range of 9%-10%)
As part of the quality control, you performed a sand-cone test on the compacted soil and obtained the following data:
Density of the sand (kg/m^3)= 1500; Mass of sand to fill the cone = 0.524 kg
c)
Mass of jar+cone+sand (before use)= 6.98 kg
Mass of jar+cone+sand (after use)= 5.84 kg
Mass of moist soil from hole = 0.87 kg
Moisture content of soil = 0.14
What is the dry unit weight of the compacted soil?
e) Based on your results from the sand-cone test, does the field compaction meet the specifications? (if not, the contractor must redo the work).
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