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Soils Table
General classification
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Granular materials
35% or less passing 0.075 mm
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Silt / Clay materials
more than 35% passing
0.075 mm
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| Group classification
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A-1-a
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A-1-b
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A3
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A-2-4
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A-2-5
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A-2-6
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A-2-7
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A4
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A5
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A6
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A-7-5
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A-7-6
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Sieve analysis -
% passing
2.000 mm
0.425 mm
0.075 mm
|
<=50
<=30
<=15 |
<=50
<=25 |
< 50
>=10 |
<=35 |
<=35 |
<=35 |
<=35 |
<=35 |
<=35 |
<=35 |
<=35 |
<=35 |
Characteristics of fraction passing
0.425 mm
Liquid Limit
Plasticity index
|
<=6 |
<=6 |
NP |
<=40
<=10 |
> 40
<=10 |
<=40
>
10
|
>40
>10 |
<=40
<=10 |
> 40
<=10 |
<=40
>
10
|
> 40
<=LL-30 |
> 40
>
LL-30
|
| Group index
|
0 |
0 |
0 |
0 |
0 |
<=4 |
<=4 |
<=8 |
<=12 |
<=16 |
<=20 |
<=20 |
| Usual types of significant constituent materials
|
Stone fragments gravel and sand
|
Fine
sand
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Silty or clayey gravel and sand
|
Silty soils
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Clayey
soils
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| General rating as subgrade
|
Excellent to good
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Fair to poor
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| ISS
2500 rating
|
Fair to poor*
|
Un-
suit-
able*
|
Excellent to good
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ISS works with most soil types encountered in road construction, A-2-4, A-2-6, A4, A5, A-6 and A-7. In addition, the soil should have a PI with a minimum of 10% of soil particles passing through the 0.075mm sieve.
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