PROBLEM 7: The laboratory results of a soil test are as follows: Sieve Percent No. #4 #10 #40 #200 passing 100 93.20 81 55 45 17 LL PL Find the group index according to AASHTO classification system. Hint: GI = (F-35)[0.20 + 0.005(LL - 40)] + 0.01(F – 15)(PI – 10) %3D
PROBLEM 7: The laboratory results of a soil test are as follows: Sieve Percent No. #4 #10 #40 #200 passing 100 93.20 81 55 45 17 LL PL Find the group index according to AASHTO classification system. Hint: GI = (F-35)[0.20 + 0.005(LL - 40)] + 0.01(F – 15)(PI – 10) %3D
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:AASHTO TABLE 3.1
A
B
D
E
F
H
J
K
Silt-clay Materials
(more than35% of total sample passing No.200)
General classification
Granular Materials
(35% or less of total sample passing No.200)
Group
classification
A-4
А5
A-6
А-7
A-1
А-2
A-7-5
А-7-6>
А-1-а
A-1-b
А-3
A-2-4
A-2-5
A-2-6
A-2-7
Sieve Analysis(percentage
passing)
No.10
50 max
No.40
30 max
50 max
51 min
No.200
15 max
25max
10max
35max
35max
35max
35max
36 min
36min
36min
36min
Characteristics of fraction
passing No.40
Liquid Limit
Plasticity Index
40max
41min
40max
41min
40max
41min
40max
41min
6 max
NP
10max
10max
11min
11min
10max
10max
11min
11min
Usual types of significant
constituent material
Silty or clayey gravel and sand
Silty soils
Clayey soils
Stone fragments,
gravel and sand
Fine
Sand
General Subgrade rating
Excellent
Fair to poor
to good
For A-7-5, PI < LL-30
ForA-7-6, PI >LL-30
![PROBLEM 7:
The laboratory results of a soil test are
as follows:
Sieve
No.
# 4
#10
#40
#200
LL
PL
Percent
passing
100
93.20
81
55
45
17
Find the group index according to
AASHTO classification system.
Hint:
GI = (F-35)[0.20 + 0.005(LL – 40)]
+ 0.01(F – 15)(PI – 10)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc47aba34-af98-41b2-a1c3-02fda0528a06%2F030ed649-48c5-4c49-a7be-2e2d38624dfc%2Fsoaf8bd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:PROBLEM 7:
The laboratory results of a soil test are
as follows:
Sieve
No.
# 4
#10
#40
#200
LL
PL
Percent
passing
100
93.20
81
55
45
17
Find the group index according to
AASHTO classification system.
Hint:
GI = (F-35)[0.20 + 0.005(LL – 40)]
+ 0.01(F – 15)(PI – 10)
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