image-stone fragments

STANDARD SPECIFICATIONS FOR AGGREGATES
Materials for Aggregate and Soil–Aggregate Subbase, Base, and Surface Courses

AASHTO M 147-17

Standard Specifications for Aggregates

Materials for Aggregate and Soil–Aggregate Subbase, Base, and Surface Courses

Standard AASHTO M 147-17

AASHTO M 147-17 specification covers the quality and grading of gravel, stone, or slag screenings; or sand, crusher run coarse aggregate consisting of gravel, crushed stone, or slag with or without soil mortar; sand–clay mixtures; or any combination of these materials for use in the construction of subbase, base, and surface courses. Grading requirements of the soil-aggregate material is given in input table below.

General Requirements for Coarse Aggregates:
Coarse aggregate retained on the 2.00-mm (No. 10) sieve shall consist of hard, durable particles or fragments of stone, gravel, or slag. Materials should possess adequate freeze thaw resistance. Coarse aggregate shall have a percentage of wear of not more than 50 when tested as per AASHTO T 96 (Los Angeles test).
General Requirements for Fine Aggregates:
Fine aggregate passing the 2.00-mm (No. 10) sieve shall consist of natural or crushed sand, and fine mineral particles passing the 75-μm (No. 200) sieve. The fraction passing the 75-μm (No. 200) sieve shall not be greater than two thirds of the fraction passing the 0.425-mm (No. 40) sieve. The fraction passing the 0.425-mm sieve shall have a liquid limit not greater than 25 and a plasticity index not greater than 6. All material shall be free from vegetable matter and lumps or balls of clay.
Materials for sub-base and base course shall conform to Gradings A, B, C, D, E, or F. Materials for surface course shall conform to Gradings C, D, E, or F. In order to prevent damage by frost action, the engineer may specify lower percentages for materials passing the 75-μm (No. 200) sieve than that required in table given.

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SOIL AGGREGATE MATERIALS: PARTICLE SIZE GRADING INPUT TABLE

Sieve Size, mm Percent Passing
Sample
Grading A
UL
Grading A
LL
Grading B
UL
Grading B
LL
Grading C
UL
Grading C
LL
Grading D
UL
Grading D
LL
Grading E
UL
Grading E
LL
Grading F
UL
Grading F
LL
50.0 100 100
25.0 95 75 100 100 100 100
9.5 65 30 75 40 85 50 100 60
4.75 55 25 60 30 65 35 85 50 100 55 100 70
2.00 40 15 45 20 50 25 70 40 100 40 100 55
0.425 20 8 30 15 30 15 45 25 50 20 70 30
0.075 8 2 20 5 15 5 20 5 20 6 25 8



PARTICLE SIZE GRADING COMPARISON - CHART



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