Contents 1005-1 - GENERAL 1005-2 - HANDLING AND STORING AGGREGATES 1005-3 - GRADATION 1005-4 - TESTING

1005-1 GENERAL

Obtain aggregates from sources participating in the Department's Aggregate QC/QA Program as described in Section 1006. Obtain aggregates from pre-approved sources, or have the source approved before use. Approval of such sources is based not only on the quality of the aggregate, but also on satisfactory production facilities and procedures. A list of approved aggregate sources participating in the Department's Aggregate QC/QA Program in North Carolina and adjoining states is available from the Materials and Tests Unit. This list includes aggregates meeting Specification requirements but whose use is restricted due to history of unsatisfactory service performance. Use of aggregates is allowed in the work provided they have been properly stockpiled in units of not less than 300 tons, tests of representative samples of these aggregates indicate satisfactory compliance with the Specifications and the source meets all the requirements of the Aggregate QC/QA Program.

Separate aggregate containing rock of more than one identifiable rock type or particles of visibly different degrees of weathering in amounts of 10% or more into each individual type. Aggregate is acceptable only if each type does not exceed the percentage of wear specified for a particular use.

Blended aggregates from different sources are allowed if all aggregates meet the Specifications for soundness or resistance to abrasion.

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1005-2 HANDLING AND STORING AGGREGATES

Handle and stockpile aggregates in such a manner to minimize segregation.

Provide sites for aggregate stockpiles that are cleared, grubbed and cleaned with a firm, smooth and well drained ground surface. Maintain a cover of at least 3" of aggregate over the ground surface to avoid the inclusion of soil or foreign material. Operate trucks or other equipment on a stockpile in an acceptable manner.

Space or separate with suitable walls or partitions stockpiles of different types or sizes of aggregates to prevent the mixing of the aggregates. Identify stockpiles with signs that can be read from a distance of at least 50 ft from the pile.

Do not allow the stockpile to become contaminated with foreign matter or degrade excessively. Failure of aggregate samples to meet all gradation requirements due to excessive degradation will be determined by sieve tests of samples taken from any portion of the stockpile and is cause for discontinuance of such stockpiling procedure.

Use material that consists mainly of rock dust produced through normal handling of the aggregate and that is essentially free from clay or shale.

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1005-3 GRADATION

Grade all standard sizes of aggregate to meet Tables 1005-1 or 1005-2.

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1005-4 TESTING

Aggregates will be tested in accordance with the test methods below except where other test procedures are required by other articles covering a particular application.

Property	Test Method
Gradation	AASHTO T 27 and T11, AASHTO T 88 as Modified for Base Course and Stabilizer
Liquid Limit	AASHTO T 89 as Modified
Plasticity Index	AASHTO T 90
Resistance to Abrasion (Percentage of Wear)	AASHTO T 96
Soundness	AASHTO T 104 Using Sodium Sulfate

Copies of modified test procedures are available from the Materials and Tests Unit.

VIEW TABLE 1005-1 AGGREGATE GRADATION - COARSE AGGREGATE

When aggregates are used for Portland cement concrete, asphalt treatment and asphalt plant mix, the requirements pertaining to material passing the No. 200 sieve are as follows:

When tested during production, the amount of material passing the No. 200 sieve shall be no greater than 0.6%. When tested in a stockpile at the quarry site, the amount of material passing the No. 200 sieve shall be no greater than 1.0%.
When tested at the job site before use, the amount of material passing the
No. 200 sieve shall:

Be no greater than 1.5% for aggregate used in Portland cement concrete or asphalt surface treatment.
Be no greater than 2.0% for aggregate used in asphalt plant mix.

If a stockpile at the job site is found to contain in excess of the specified amount of material passing the No. 200 sieve before use, the Engineer may approve its use provided:

For aggregate used in Portland cement concrete, the total percentage by weight passing the No. 200 sieve in the combined coarse and fine aggregate in the mix does not exceed 2.0%, and provided no increase in water-cement ratio is required by the use of this aggregate.
For aggregate used in asphalt plant mix, the total percentage by weight of minus No. 200 material in the plant mix being produced, as determined by the extraction test, can be maintained within the limits allowed by the job mix formula.

For ABC and ABC(M), in addition to the gradation requirements, the material passing the No. 40 sieve shall not have a LL in excess of 30 nor a PI in excess of 6. For ABC used in asphalt plant mix, when tested during production, in a stockpile at the quarry site or at the job site before use, the amount of material passing the No. 200 sieve shall be from 0.0% to 12.0% by weight and the gradation requirements for material passing the No. 10 sieve (soil mortar) required in Section 1010 for ABC will not apply. For ABC not used in asphalt plant mix, the gradation requirements for material passing the No. 10 sieve (soil mortar) will be as required in Section 1010.

TABLE 1005-2 AGGREGATE GRADATION FINE AGGREGATE
Std. Size #	Percentage of Total by Weight Passing								Remarks
	3/8"	#4	#8	#16	#30	#50	#100	#200
1S	100	90-100		40-85		0-20		0-3	Blotting Sand, Asphalt Retreatment
2S	100	95-100	80-100	45-95	25-75	5-30	0-10	0-3	Concrete, Shotcrete, Grout, Subsurface Drainage, Blotting Sand
2MS		95-100	80-100	45-95	25-75	5-35	0-20	0-8^A	Concrete, Shotcrete, Grout, Subsurface Drainage
4S		100	95-100			15-45	0-10	0-5	Mortar

When tested at the job site before use, the amount of material passing the
No. 200 sieve shall not be greater than 10%.

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Contract Standards 2012 Standard Specifications Manual

Contract Standards
2012 Standard Specifications Manual