AASHTO SYSTEM Flashcards by Catherine Themis

Q

Percent Passing:

2.00 mm (No. 10): 50% max
0.425 mm (No. 40): 30% max
0.075 mm (No. 200): 15% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: —
Plasticity Index: —

Usual Type of Significant Material:

Stone fragments, gravel, and sand

General Rating as Subgrade:

Excellent to Good

A

A-1-a

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Q

Percent Passing:

0.425 mm (No. 40): 50% max
0.075 mm (No. 200): 25% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: —
Plasticity Index: —

Usual Type of Significant Material:

Gravel and sand

General Rating as Subgrade:

Excellent to Good

A

A-1-b

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Q

Percent Passing:

0.425 mm (No. 40): 50% max
0.075 mm (No. 200): 10% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: —
Plasticity Index: Non-plastic (N.P.)

Usual Type of Significant Material:

Fine sand

General Rating as Subgrade:

Excellent to Good

A

A-3

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Q

Percent Passing:

0.075 mm (No. 200): 35% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≤ 40
Plasticity Index: ≤ 10

Usual Type of Significant Material:

Silty or clayey gravel and sand

General Rating as Subgrade:

Excellent to Good

A

A-2-4

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Q

Percent Passing:

0.075 mm (No. 200): 35% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≥ 41
Plasticity Index: ≤ 10

Usual Type of Significant Material:

Silty or clayey gravel and sand

General Rating as Subgrade:

Excellent to Good

A

A-2-5

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Q

Percent Passing:

0.075 mm (No. 200): 35% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≤ 40
Plasticity Index: ≥ 11

Usual Type of Significant Material:

Silty or clayey gravel and sand

General Rating as Subgrade:

Excellent to Good

A

A-2-6

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Q

Percent Passing:

0.075 mm (No. 200): 35% max

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≥ 41
Plasticity Index: ≥ 11

Usual Type of Significant Material:

Silty or clayey gravel and sand

General Rating as Subgrade:

Excellent to Good

A

A-2-7

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Q

Percent Passing:

0.075 mm (No. 200): 36% min

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≤ 40
Plasticity Index: —

Usual Type of Significant Material:

Silty soils

General Rating as Subgrade:

Fair to Poor

A

A-4

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Q

Percent Passing:

0.075 mm (No. 200): 36% min

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≥ 41
Plasticity Index: —

Usual Type of Significant Material:

Silty soils

General Rating as Subgrade:

Fair to Poor

A

A-5

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Q

Percent Passing:

0.075 mm (No. 200): 36% min

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≥ 41
Plasticity Index: ≤ LL - 30

Usual Type of Significant Material:

Clayey soils

General Rating as Subgrade:

Fair to Poor

A

A-7-5

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Q

Percent Passing:

0.075 mm (No. 200): 36% min

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≤ 40
Plasticity Index: ≥ 11

Usual Type of Significant Material:

Clayey soils

General Rating as Subgrade:

Fair to Poor

A

A-6

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Q

Percent Passing:

0.075 mm (No. 200): 36% min

Characteristics of Fraction Passing No. 40:

Liquid Limit: ≥ 41
Plasticity Index: > LL - 30

Usual Type of Significant Material:

Clayey soils

General Rating as Subgrade:

Fair to Poor

A

A-7-6

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