| Laboratory testing was performed on two soil samples (A and B). (a) Determine the USCS classification symbol for Sample A. (b) Determine the AASHTO classification for Sample B. Sieve No. Sieve Opening (mm) A- Percent Passing B - Percent Passing 3 inch 76.2 100 1.5 inch 38.1 98 0.75 inch 19.1 96 4 4.75 77 100 10 2.000 96 20 0.85 55 94 40 0.425 73 100 0.15 30 200 0.075 18 55 Liquid Limit 32 52 Plastic Limit 25 32 A Silty Clay (CL) sample was extruded from a 6-inch long tube with a diameter of 2.83 inches and weighed 1.71 lbs. (a) Calculate the wet density of the CL sample. (b) A small piece of the CL sample had a wet weight of 140.9 grams and a weight of 85.2 grams after drying. Compute the water content. (c) Compute the dry density of the CL sample A Standard Proctor test was performed on a soil with a specific gravity of 2.71. For the water content and wet soil unit weight in the following table: a) Plot the moisture-dry unit weight curve b) Find the maximum dry density and optimum water content c) Determine the moisture range permitted for a contractor to achieve at least 90% relative compaction. d) What volume of water in cubic feet must be added to obtain 1 cubic yard of soil at the maximum dry density if the soil was originally at 10% water content? Water Content (%) Wet Density (pcf) 10 98 13 106 16 119 18 125 20 129 22 128 25 123
| Laboratory testing was performed on two soil samples (A and B). (a) Determine the USCS classification symbol for Sample A. (b) Determine the AASHTO classification for Sample B. Sieve No. Sieve Opening (mm) A- Percent Passing B - Percent Passing 3 inch 76.2 100 1.5 inch 38.1 98 0.75 inch 19.1 96 4 4.75 77 100 10 2.000 96 20 0.85 55 94 40 0.425 73 100 0.15 30 200 0.075 18 55 Liquid Limit 32 52 Plastic Limit 25 32 A Silty Clay (CL) sample was extruded from a 6-inch long tube with a diameter of 2.83 inches and weighed 1.71 lbs. (a) Calculate the wet density of the CL sample. (b) A small piece of the CL sample had a wet weight of 140.9 grams and a weight of 85.2 grams after drying. Compute the water content. (c) Compute the dry density of the CL sample A Standard Proctor test was performed on a soil with a specific gravity of 2.71. For the water content and wet soil unit weight in the following table: a) Plot the moisture-dry unit weight curve b) Find the maximum dry density and optimum water content c) Determine the moisture range permitted for a contractor to achieve at least 90% relative compaction. d) What volume of water in cubic feet must be added to obtain 1 cubic yard of soil at the maximum dry density if the soil was originally at 10% water content? Water Content (%) Wet Density (pcf) 10 98 13 106 16 119 18 125 20 129 22 128 25 123
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:|Laboratory testing was performed on two soil samples (A and B).
(a) Determine the USCS classification symbol for Sample A.
(b) Determine the AASHTO classification for Sample B.
Sieve No.
Sieve Opening (mm)
A- Percent Passing
B - Percent Passing
3 inch
76.2
100
1.5 inch
38.1
98
0.75 inch
19.1
96
4
4.75
77
100
10
2.00
96
20
0.85
55
94
40
0.425
73
100
0.15
30
200
0.075
18
55
Liquid Limit
32
52
Plastic Limit
25
32
A Silty Clay (CL) sample was extruded from a 6-inch long tube with a diameter
of 2.83 inches and weighed 1.71 lbs. (a) Calculate the wet density of the CL
sample. (b) A small piece of the CL sample had a wet weight of 140.9 grams and
a weight of 85.2 grams after drying. Compute the water content. (c) Compute the
dry density of the CL sample
A Standard Proctor test was performed on a soil with a specific gravity of 2.71.
For the water content and wet soil unit weight in the following table:
a) Plot the moisture-dry unit weight curve
b) Find the maximum dry density and optimum water content
c) Determine the moisture range permitted for a contractor to achieve at least
90% relative compaction.
d) What volume of water in cubic feet must be added to obtain 1 cubic yard of
soil at the maximum dry density if the soil was originally at 10% water
content?
Water Content (%)
Wet Density (pcf)
10
98
13
106
16
119
18
125
20
129
22
128
25
123
Expert Solution
Step 1
Note: We'll answer the first question since the exact one wasn't mentioned. Please resubmit a new question mentioning the one you'd like answered.
1. Particle A: USCS classification
According to the data given 77% of particles passes through 4.75 mm sieve size so the given soil samples is "Sand".
Fineness of particle A is 18% (Percentage of particles passing through 75 sieve size) and it's plasticity index .
Therefore, the given soil is "Silty-clayey sand" represented as "SM-SC".
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