The gradation for gravel materials used in compacted aggregate base shall conform to #53 of the state Highway Standard Specifications or the following:
Classification of Aggregates | |||||||
Requirements | Material | Class A | Class B | Class C | Class D | Class E | Class F |
Classification of Aggregates | |||||||
Requirements | Material | Class A | Class B | Class C | Class D | Class E | Class F |
Quality: Los Angeles abrasion1, percent max. | 40.0 | 40.0 | 45.0 | 45.0 | 50.0 | ||
Quality: sodium sulfate soundness2, percent max. | 12.0 | 12.0 | 16.0 | 16.0 | 20.0 | 25.0 | |
Quality: absorption3, percent max. | Aggregate for bituminous mixtures | 5.0 | 5.0 | 5.0 | 5.0 | ||
Quality: absorption3, percent max. | Aggregate for cement concrete | 5.0 | 5.0 | ||||
Additional: deleterious, percent, max. | Friable particles | 0.2 | 0.2 | 0.2 | 0.2 | ||
Additional: deleterious, percent, max. | Ocher | 1.0 | 1.0 | 1.0 | 1.0 | ||
Additional: deleterious, percent, max. | Shells | 0.7 | 0.7 | 1.0 | 1.0 | ||
Additional: deleterious, percent, max. | Non-durable4 | 4.0 | 4.0 | 4.0 | 6.0 | ||
Additional: deleterious, percent, max. | Sum of the above | 5.0 | 5.0 | 6.0 | 8.0 | 10.0 | |
Additional: deleterious, percent, max. | Coke7 | ||||||
Additional: deleterious, percent, max. | Iron7 | ||||||
Chert (less than 2.45 bulk spec. gravity)5 percent, max. | 3.0 | 5.0 | 8.0 | 10.0 | |||
Weight per cubic foot; pounds, min. | For slag | 75.0 | 75.0 | 70.0 | 70.0 | 70.0 | |
Crushed aggregate6; percent, min. | Mechanical | 20.0 | 20.0 | 20.0 | 20.0 | ||
Crushed aggregate6; percent, min. | Total | 85.0 | 85.0 | 50.0 | 35.0 | ||
Notes: | |||||||
1.
Los Angeles abrasion requirements shall not apply to blast furnace slag. | |||||||
2.
Aggregates failing to meet the sodium sulfate soundness requirements may, at the option of the engineer, be subjected to 50 cycles of freezing and thawing and may be accepted, provided they do not have a loss greater than specified for sodium sulfate soundness. | |||||||
3.
(a)
Absorption requirements shall not apply to blast furnace slag. | |||||||
3.
(b)
When crushed stone coarse aggregate consists of ledges whose absorptions differ by more than two percentage points, the finished product will be determined on the basis of production samples from the stockpile obtained at the frequency set out in Indiana Test Method No. 203. | |||||||
4.
Non-durable particles as determined by AASHTO T-189 and other particles which are structurally weak, such as soft sandstone shale, limonite concretions, coal weathered schist, or cemented gravel. Determination of non-durable particles shall be made from the total weight of material retained on the three-eighths inch sieve. Scratch hardness test shall not apply to crushed stone course aggregate. | |||||||
5.
The bulk specific gravity on chert shall be based on the saturated surface dry condition. The amount of chert (less than 2.45 bulk specific gravity) shall be determined on the total weight of material retained on the three-eighths inch sieve for sizes one through eight inclusive, 53, 58B, 73, and 73B, and on the total weight of material retained on the No. 4 sieve for sizes nine and eleven. | |||||||
6.
The crushed aggregate requirements, unless otherwise specified, will apply only to gravel coarse aggregate used in bituminous mixtures or compacted aggregate base, shoulders, or surface. The crushed aggregate requirements will not apply to size twelve aggregate. Blending of crushed stone with gravel in order to comply with the mechanically crushed requirements will be permitted when approved. Determination of crushed particles shall be made on material retained on the No. 4 sieve. | |||||||
7. Air-cooled blast-furnace slag coarse aggregate shall be free of objectionable amounts of coke and/or iron. | |||||||
8.
Coarse aggregate may be accepted or rejected based on previous service records.
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(`88 Code, § 8-111, Table 8) (Ord. 98-20, passed 11-10-98)