It was proposed that a certain soil is to be used as a subgrade material for a highway project. Upon testing, it was found out that it's liquid and plastic limit is 200% and 47%, respectively. Grain-size analysis revealed that more than 50% passes through Sieve No. 200, 25% is larger than 3/8-inch, and 10% is larger than 3/4-inch. Its natural water content was known to be 6%. Proctor test is then carried out for further investigation and the following information was recorded. Ave, Mass of Moisture Cans = 0.09259 Ib Assumed Specific Gravity of Soil Particles = 2.70 Mass of Proctor Mold = 18 lb Trial No. 1 3 4 5 Mass of Wet Soil + Proctor Mold (Ib) 24.175 24.824 24.916 24.665 23.974 Mass of moisture can 0.2316 0.2213 0.2529 0.2960 0.2411 + wet soil specimen (Ib) Mass of moisture can 0.2273 0.2158 0.2441 0.2833 0.2310 + dry soil specimen (Ib) What is the maximum dry unit weight? o 98.60 Ib/cu.ft. O 98.30 Ib/cu.ft O None of the choices. o 99.00 Ib/cu.ft. o 98.00 Ib/cu.ft. What is the optimum moisture content of the compacted soil? o 5.80% O None of the choices. O 5.00% O 6.20% O 5.40% O None of the choices. O 5.00% O 6.20% o 5.40% If 95% relative compaction is desired, what is the required minimum dry density of the compacted soil? o 94.05 Ib/cu.ft. O 93.67 Ib/cu.ft. O None of the choices. O 93.10 Ib/cu.ft. o 93.39 Ib/cu.ft.
It was proposed that a certain soil is to be used as a subgrade material for a highway project. Upon testing, it was found out that it's liquid and plastic limit is 200% and 47%, respectively. Grain-size analysis revealed that more than 50% passes through Sieve No. 200, 25% is larger than 3/8-inch, and 10% is larger than 3/4-inch. Its natural water content was known to be 6%. Proctor test is then carried out for further investigation and the following information was recorded. Ave, Mass of Moisture Cans = 0.09259 Ib Assumed Specific Gravity of Soil Particles = 2.70 Mass of Proctor Mold = 18 lb Trial No. 1 3 4 5 Mass of Wet Soil + Proctor Mold (Ib) 24.175 24.824 24.916 24.665 23.974 Mass of moisture can 0.2316 0.2213 0.2529 0.2960 0.2411 + wet soil specimen (Ib) Mass of moisture can 0.2273 0.2158 0.2441 0.2833 0.2310 + dry soil specimen (Ib) What is the maximum dry unit weight? o 98.60 Ib/cu.ft. O 98.30 Ib/cu.ft O None of the choices. o 99.00 Ib/cu.ft. o 98.00 Ib/cu.ft. What is the optimum moisture content of the compacted soil? o 5.80% O None of the choices. O 5.00% O 6.20% O 5.40% O None of the choices. O 5.00% O 6.20% o 5.40% If 95% relative compaction is desired, what is the required minimum dry density of the compacted soil? o 94.05 Ib/cu.ft. O 93.67 Ib/cu.ft. O None of the choices. O 93.10 Ib/cu.ft. o 93.39 Ib/cu.ft.
Chapter2: Loads On Structures
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Transcribed Image Text:It was proposed that a certain soil is to be used as a subgrade material for a highway
project. Upon testing, it was found out that it's liquid and plastic limit is 200% and 47%,
respectively. Grain-size analysis revealed that more than 50% passes through Sieve No.
200, 25% is larger than 3/8-inch, and 10% is larger than 3/4-inch. Its natural water content
was known to be 6%. Proctor test is then carried out for further investigation and the
following information was recorded.
Ave. Mass of Moisture Cans = 0.09259 lb
Assumed Specific Gravity of Soil Particles = 2.70
Mass of Proctor Mold = 18 Ib
Trial No.
1
4
5
Mass of Wet
Soil + Proctor
Mold (Ib)
24.175
24.824
24.916
24.665
23.974
Mass of
moisture can
0.2316
0.2213
0.2529
0.2960
0.2411
+ wet soil
specimen (Ib)
Mass of
moisture can
+ dry soil
specimen (Ib)
0.2273
0,2158
0.2441
0.2833
0.2310
What is the maximum dry unit weight?
o 98.60 Ib/cu.ft.
.
O 98.30 Ib/cu.ft
O None of the choices.
o 99.00 Ib/cu.ft.
O 98.00 lb/cu.ft.
What is the optimum moisture content of the compacted soil?
O 5.80%
O None of the choices.
o 5.00%
O 6.20%
O 5.40%
O None of the choices.
o 5.00%
O 6.20%
O 5.40%
If 95% relative compaction is desired, what is the required minimum dry density of the
compacted soil?
O 94.05 Ib/cu.ft.
O 93.67 Ib/cu.ft.
O None of the choices.
o 93.10 Ib/cu.ft.
O 93.39 Ib/cu.ft.
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