Classify the following soils by the AASHTO classification system.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Classify the following soils by the AASHTO classification system.
Description
Percent finer than No. 10 sieve
Percent finer than No. 40 sieve
Percent finer than No. 200 sieve
Soil A
Soil B
Soil C
100
92
94
82
38
81
85
51
52
Liquid limit
Plastic Limit
42
29
43
23
16
34
Table 3.1: Classification of Highway Subgrade Materials
General
class fication
Granular materials
(35% or less of total sample passing No. 200)
A-2
A-1
Group
classification
Sieve analysis
(percentage
passing)
No. 10
No. 40
No. 200
Characteristics of
fraction passing
No. 40
Liquid limit
Plasticity index
Usual types of
significant
constituent
materials
A-1-a
A-1-b
A-3
A-2-4
A-2-5
A-2-6
A-2-7
50 max.
30 max. 50 max. 51 min.
15 max. 25 max. 10 max. 35 max. 35 max. 35 max. 35 max.
40 max. 41 min. 40 max. 41 min.
10 max. 10 max. 11 min. 11 min.
6 max.
NP
Stone fragments,
gravel, and sand
Fine
sand
Sity or clayey gravel and sand
General subgrade
rating
Excellent to good
What is the classification of Soil A?
O A-5(3)
A-7-5(3)
O A-7-6(3)
O A-6(3)
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