• 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 A-2 Procedure: 76 Group classification A-1-a A-I-b A-3 A-2-4 A-2-5 A-2-6 A-2-7 40 48 92 O Group Classification • with required test data in minol, proceed from left to right, inchart. The correct group will be found by process of elimination. The first group from the left consistent with the test dlatta is the conect classficaton. 200 20 86 34 Sieve analysis (percentage passing) No. 10 No. 40 LL 20 70 37 50 man 30 max. 15 max. 50 max 25 max. 51 min. 10 max PI 5 32 18 35 max 35 max. No. 200 Characteristics of fraction 35 max. 35 mas. Using AASHTO 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 40 max 41 min. 40 max. 41 min. 6 max. Stone fragments gravel, and sand Il min. Siky or clayey gravel and sand Il min. NP 10 max. 10 max. O Group Index Fine constituent materials sand General subgrade rating GI=(Fco-35)(00OBLL) +a01(Fa00-15)(PI-10) • if the equation has a negatve value, GI ISO. • the group index number calculated from the equatton Is rounded off to the nearest whole number (note: round off) • the group index number for soil groups, namely: (A-1-a, A-s-b, A-3, A-2-4, A-2-5) is O. • when calaulating the GI for sols that belong to groups A2-6 ard A-2-7, use portial GI(for PI): GI= 0.01(Faco-15XPI-10) Excellent to good 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 A-5 A-6 Sieve analysis (percentage passing) No. 10 No. 40 No. 200 Characteristies of fraction passing No. 40 Liquid limit Plasticity indes Usual types of significant constituent materials General subgrade rating 36 min. 36 min. 36 min. 36 min. 40 max. 10 max 41 min 10 max 40 max Il min. Clayey soils 41 min. Il min. . Silty soils Fair to poor
• 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 A-2 Procedure: 76 Group classification A-1-a A-I-b A-3 A-2-4 A-2-5 A-2-6 A-2-7 40 48 92 O Group Classification • with required test data in minol, proceed from left to right, inchart. The correct group will be found by process of elimination. The first group from the left consistent with the test dlatta is the conect classficaton. 200 20 86 34 Sieve analysis (percentage passing) No. 10 No. 40 LL 20 70 37 50 man 30 max. 15 max. 50 max 25 max. 51 min. 10 max PI 5 32 18 35 max 35 max. No. 200 Characteristics of fraction 35 max. 35 mas. Using AASHTO 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 40 max 41 min. 40 max. 41 min. 6 max. Stone fragments gravel, and sand Il min. Siky or clayey gravel and sand Il min. NP 10 max. 10 max. O Group Index Fine constituent materials sand General subgrade rating GI=(Fco-35)(00OBLL) +a01(Fa00-15)(PI-10) • if the equation has a negatve value, GI ISO. • the group index number calculated from the equatton Is rounded off to the nearest whole number (note: round off) • the group index number for soil groups, namely: (A-1-a, A-s-b, A-3, A-2-4, A-2-5) is O. • when calaulating the GI for sols that belong to groups A2-6 ard A-2-7, use portial GI(for PI): GI= 0.01(Faco-15XPI-10) Excellent to good 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 A-5 A-6 Sieve analysis (percentage passing) No. 10 No. 40 No. 200 Characteristies of fraction passing No. 40 Liquid limit Plasticity indes Usual types of significant constituent materials General subgrade rating 36 min. 36 min. 36 min. 36 min. 40 max. 10 max 41 min 10 max 40 max Il min. Clayey soils 41 min. Il min. . Silty soils Fair to poor
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
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
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning