Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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AASHTO SOIL CLASSIFICATION (by AASHTO)
AASHTO = American Association of State Highway
and Transport Officials
Situation 2
Classification of Highway Subgrade Materials
% FINER
SOIL B
SIEVE
General
classification
Granular materials
(35% or less of total sample passing No. 200)
SOIL A
SOIL C
10
83
100
90
A-1
А-2
Procedure:
40
48
92
76
Group classification
A-1-a
А-1-b
А-3
A-2-4
A-2-5
A-2-6
A-2-7
O Group Classification
with required test data in mind, proceed from
left to right, in chart. The correct group will be
found by process of elimination. The first group
from the left consistent with the test data is
the corect classification.
86
34
Sieve analysis
(percentage passing)
No. 10
200
20
LL
20
70
37
50 max.
30 max.
No. 40
No. 200
Characteristics of fraction
PI
32
18
50 max.
51 min.
15 max.
25 max.
10 max.
35 max.
35 max.
35 max.
35 max.
Using AASHT0 method:
1. Determine the group symbol and index for soil A.
2. Determine the group symbol and index for soil B.
3. Determine the group symbol and index for soil C.
passing No. 40
Liquid limit
Plasticity index
Usual types of significant
constituent materials
40 max.
41 min.
40 max.
41 min.
11 min.
Silty or clayey gravel and sand
6 max.
NP
10 max.
10 max.
11 min.
Stone fragments,
gravel, and sand
Fine
® Group Index
sand
Excellent to good
GI=(F200-35)(0OBLL) +0.01(F200-15)(PI-10)
if the equation has a negative value, GI Is O.
the group index number calculated from the
equation is raunded off to the nearest whole
number (note: round off)
the group index number for soil grolps, namely:
(A-1-a, A-1-b, A-3,A-2-4, A-2-5) is O.
• when calculating the GI for sols that belong to
groups A-2-6 and A-2-7, Use partial GI(for PI):
General subgrade rating
Silt-clay materials
(more than 35% of total sample passing No. 200)
General classification
A-7
A-7-5
A-7-6
Group classification
A-4
А-5
A-6
Sieve analysis (percentage passing)
No. 10
No. 40
No. 200
36 min.
36 min.
36 min.
36 min.
Characteristics of fraction passing No. 40
Liquid limit
Plasticity index
Usual types of significant constituent materials
General subgrade rating
41 min.
40 max.
10 max.
40 max.
11 min.
41 min.
10 max.
11 min.
Silty soils
Clayey soils
GI= 0.01(F00-1S)(PI-10)
Fair to poor
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Transcribed Image Text:AASHTO SOIL CLASSIFICATION (by AASHTO) AASHTO = American Association of State Highway and Transport Officials Situation 2 Classification of Highway Subgrade Materials % FINER SOIL B SIEVE General classification Granular materials (35% or less of total sample passing No. 200) SOIL A SOIL C 10 83 100 90 A-1 А-2 Procedure: 40 48 92 76 Group classification A-1-a А-1-b А-3 A-2-4 A-2-5 A-2-6 A-2-7 O Group Classification with required test data in mind, proceed from left to right, in chart. The correct group will be found by process of elimination. The first group from the left consistent with the test data is the corect classification. 86 34 Sieve analysis (percentage passing) No. 10 200 20 LL 20 70 37 50 max. 30 max. No. 40 No. 200 Characteristics of fraction PI 32 18 50 max. 51 min. 15 max. 25 max. 10 max. 35 max. 35 max. 35 max. 35 max. Using AASHT0 method: 1. Determine the group symbol and index for soil A. 2. Determine the group symbol and index for soil B. 3. Determine the group symbol and index for soil C. passing No. 40 Liquid limit Plasticity index Usual types of significant constituent materials 40 max. 41 min. 40 max. 41 min. 11 min. Silty or clayey gravel and sand 6 max. NP 10 max. 10 max. 11 min. Stone fragments, gravel, and sand Fine ® Group Index sand Excellent to good GI=(F200-35)(0OBLL) +0.01(F200-15)(PI-10) if the equation has a negative value, GI Is O. the group index number calculated from the equation is raunded off to the nearest whole number (note: round off) the group index number for soil grolps, namely: (A-1-a, A-1-b, A-3,A-2-4, A-2-5) is O. • when calculating the GI for sols that belong to groups A-2-6 and A-2-7, Use partial GI(for PI): General subgrade rating Silt-clay materials (more than 35% of total sample passing No. 200) General classification A-7 A-7-5 A-7-6 Group classification A-4 А-5 A-6 Sieve analysis (percentage passing) No. 10 No. 40 No. 200 36 min. 36 min. 36 min. 36 min. Characteristics of fraction passing No. 40 Liquid limit Plasticity index Usual types of significant constituent materials General subgrade rating 41 min. 40 max. 10 max. 40 max. 11 min. 41 min. 10 max. 11 min. Silty soils Clayey soils GI= 0.01(F00-1S)(PI-10) Fair to poor
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