Page 10 - Grp3-Soil magazine (Final-Vid ver)

TIPS ON SOIL
TIPS ON SOIL
TIPS ON SOIL
CLASSIFICATION S O I L C L A S S I F I C A T I O N S Y S T E M
CLASSIFICATION
CLASSIFICATION
SOIL CLASSIFICATION SYSTEM
SOIL CLASSIFICATION SYSTEM
SYSTEM!
SYSTEM!
SYSTEM!
UNIFIED
I
N

C
A
AMERICAN ASSOCIATION OF
A
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E
M
O
I
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N
F
O

S
S
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O
A
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UNIFIED
N
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A
W
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STATE HIGHWAY
CLASSIFICATION
STATE HIGHWAY
G
C L A S S I F F C E D I O N AMERICAN ASSOCIATION OF
CLASSIFICATION
I
E
A
T
T
I
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& TRANSPORTATION
& TRANSPORTATION
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M
Y
(
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SYSTEM (USCS)
SYSTEM (USCS) & T R A N S P O R T A T I O N
)
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C
S
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)
O
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F
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OFFICIALS SYSTEM (AASHTO)
O
OFFICIALS SYSTEM (AASHTO)
S

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L
A
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Step 1: Determine whether Soil can be classified into seven major group A-1
through A-7. The test data are obtained from left
soils are coarse or fine-grained soil: F<50% passing
to right by elimination.
through No 200 sieve (coarse), >50% (fine)
Step 2: For coarse-grained soil, determine the
Granular materials (A-1 to A-3): 35% or less of the
percentage passing No 4 sieve and retained on
No 200 sieve, F 1. particles pass through No 200 sieve.
F 1 < (100-F)/2 is gravel, for sand is equal or greater.
For fine-grained soil, refer to silt and clay table Fined materials (A-4 to A-7): more than 35% of the
and plasticity chart to obtain group name. particles pass through No 200 sieve.
soil, group index (GI)
To evaluate the quality of
needs to be obtained. If GI obtained is negative
value, then take 0. Value of GI for A-1-a, A-1-b, A-3,
A-2-4 and A-2-5 always 0.
The rating for a pavement subgrade is inversely
proportional to the group index, GI.
USCS & AASHTO
Classification System
AASHTO TABLE
A A S H T O T A B L E PAGE 10
AASHTO TABLE