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Building Design and Construction Handbook - Merritt - Ventech!

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TABLE 6.9 AASHTO Soil Classification System<br />

Major Divisions Group<br />

Group A-1<br />

Granual<br />

materials<br />

(35% or less<br />

passing No.<br />

200 sieve)<br />

Silt-clay<br />

materials<br />

(More than 35%<br />

passing No.<br />

200 sieve)<br />

6.34<br />

Group A-3<br />

Group A-2<br />

Group A-4<br />

Group A-5<br />

Group A-6<br />

Group A-7<br />

AASHTO<br />

symbol Typical names<br />

A-1-a Stone or gravel fragments<br />

A-1-b<br />

A-3<br />

A-2-4<br />

A-2-5<br />

A-2-6<br />

A-2-7<br />

A-4<br />

A-5<br />

A-6<br />

A-7-5<br />

A-7-6<br />

Gravel <strong>and</strong> s<strong>and</strong> mixtures<br />

Fine s<strong>and</strong> that is nonplastic<br />

Silty gravel <strong>and</strong> s<strong>and</strong><br />

Silty gravel <strong>and</strong> s<strong>and</strong><br />

Clayey gravel <strong>and</strong> s<strong>and</strong><br />

Clayey gravel <strong>and</strong> s<strong>and</strong><br />

Silty soils<br />

Silty soils<br />

Clayey soils<br />

Clayey soils<br />

Clayey soils<br />

Highly organic Group A-8 A-8 Peat <strong>and</strong> other highly<br />

organic soils<br />

Sieve analysis<br />

(percent passing) Atterberg limits<br />

Percent Passing: No. 10 � 50% PI � 6<br />

No. 40 � 30% No. 200 � 15%<br />

No. 40 � 50% No. 200 � 25% PI � 6<br />

No. 40 � 50% No. 200 � 10% PI � 0 (nonplastic)<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40 PI � 10<br />

Percent passing No. 200 sieve � 35% LL � 40<br />

PI � 10<br />

PI � LL � 30<br />

Percent passing No. 200 sieve � 35% LL � 40<br />

PI � 10<br />

PI � LL � 30<br />

Primarily organic matter, dark in color, <strong>and</strong> organic odor

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