8:16 PM morgan.blackboard.com 7. A minus No. 40 material had a liquidity index o
ID: 1712383 • Letter: 8
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8:16 PM morgan.blackboard.com 7. A minus No. 40 material had a liquidity index of 0.73, a .0000 Boost natural water content of 44.5 %, and a plasticity index of 24.7. Classify this soil according to the USCS, providing the group symbol for it. You do not need to graph this data; use linear interpolation if you need specific values not given. 8. Refer to the following test data: % Passing # 200 sieve 60 Liquid Limit Plastic Limit What is the USCS Classification of this soil? 57 39 9. Classify the following soils by the AASHTO classification system and give the group indices. Liquid Pastic 96 8 2100 10. Using the Unified soil classification, please classify the following soils. Also give the group symbols and group Spercent finerLiquid Plasticity Comments Liquid Plasticity No. No. 4 No. 200 limit C-448 and C-1 100 100 100 NP 25 28 26Explanation / Answer
1) Percentage of soil finer than sieve No 200 = 3 (<50)
Therefore the soil is Coarse grained
% of soil finer than sieve number 4=94>50% . Therefore ,soil is sand
Cu=4.48(<6)
Cc = 1.22(>1 and <3)
Soil is SP
2)% of soil finer than Sieve 200=77 (>50)
Soil is fine grained.
LL=63(>50) , PI=25
PI per A-line = 0.73*(63-20)=31.39 (>25). Therefore, PI of soil is below A-line
Soil is MH
3)%finer than sieve 200 = 86
soil is fine grained
LL=55(>50), PI=28
PI per A-line = 0.73*(55-20)=25.55 (<PI)
PI is above A-line
Soil is CH
4)%finer than sieve 200 = 45(<50)
Soil is coarse grained
%finer than sieve 4=100>50
Soil is sand
LL=36,PI=22
PI per A-line = 0.73*(36-20)=11.68(<PI). PI is above A-line
Fines is classified as CH.Therefore, soil is SC
5)% finer than sieve 200 = 48(<50).Soil is coarse grained
%finer than sieve 4 = 92(>50)Soil is sand
LL=30,PI=8
PI per A-line = 0.73*(30-20)=7.3(<8)
PI is above A-line . Soil is SC
6)% finer than sieve 200=40(<50). soil is coarse grained
% finer than sieve 4 = 60(>50). Soil is sand
LL=26;PI=4
PI per A-line = 0.73*(26-20)=4.38(>4)
PI is below A-line
Soil is SM(because fines is either ML or MH)
7)% finer than sieve 200=76(>50)
Soil is fine grained
LL=60,PI=60
PI per A-line = 0.73*(60-20)=29.2(<60)
PI is above A-line
Soil is CH
LL=36
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