Classify the soil using AASHTO. The liquid limit and plastic limit are found to be 30 and 20, respectively. The following data are obtained: Percent passing No. 4 sieve: 100% Percent passing No. 10 sieve: 91% Percent passing No. 40 sieve: 60% Percent passing No. 200 sieve: 20%
Classify the soil using AASHTO. The liquid limit and plastic limit are found to be 30 and 20, respectively. The following data are obtained: Percent passing No. 4 sieve: 100% Percent passing No. 10 sieve: 91% Percent passing No. 40 sieve: 60% Percent passing No. 200 sieve: 20%
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter4: Mechanical Processes
Section: Chapter Questions
Problem 4.9P
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Classify the soil using AASHTO. The liquid limit and plastic limit are found to be 30 and 20, respectively. The following data are obtained:
Percent passing No. 4 sieve: 100%
Percent passing No. 10 sieve: 91%
Percent passing No. 40 sieve: 60%
Percent passing No. 200 sieve: 20%
Transcribed Image Text:Table 5.1 Classification of Highway Subgrade Materials
General
classification
Granular materials
(35% or less of total sample passing No. 200)
A-1
A-2
Group classification
A-1-a
A-1-b
A-3
A-2-4
A-2-5
A-2-6
A-2-7
Sieve analysis
(percentage passing)
No. 10
No. 40
50 max.
30 max.
50 max.
51 min.
No. 200
15 max.
25 max.
10 max.
35 max.
35 max.
35 max.
35 max.
Characteristics of fraction
passing No. 40
Liquid limit
Plasticity index
Usual types of significant
constituent materials
40 max.
11 min.
Silty or clayey gravel and sand
41 min.
10 max.
40 max.
41 min.
6 max.
Stone fragments,
gravel, and sand
NP
10 max.
11 min.
Fine
sand
General subgrade rating
Excellent to good
70
Silt-clay materials
(more than 35%% of total sample passing No. 200)
General classification
60
A-7
A-7-5
A-7-6
50
Group classification
A-4
A-5
A-6
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
General subgrade rating
40
A-7-6
36 min.
36 min.
36 min.
36 min.
30
A-2-6
41 min.
10 max.
41 min.
Il min.
40 max
40 max.
A-6
20
10 max.
|l min.
A-2-7
A-7-5
Silty soils
Clayey soils
Fair to poor
10
"For A-7-5. PI s LL-30
"For A-7-6, PI> LL- 30
A-2-4
A-2-5
A-4
A-5
10
20
30
40
50
60
70
NO
90
00
Liquid limit
Plasticity index
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