10-26 1003 -7 Mixing and Delivery
Use grout free of any lumps and undispersed cement. When using an approved packaged grout, mix grout in accordance with the manufacturer’s instructions. Otherwise, comply with Articles 1000 -9 through 1000 -13 to the extent applicable for grout instead of concrete. 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 through the Department’s Aggregate QC/QA Program 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. 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 sat isfactory compliance with the s pecifications 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. 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 inches 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. Do not allow the stockpile to become contaminate d 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. Stockpiled aggregates should be essentially free of clay or shale particles, and should contain dust that is primarily rock dust produced through normal handling of the aggregate. Sampling stockpiles for conformance shall be conducted as described in the Aggregate QC/QA Program manual. 1005 -3 GRADATION Grade all standard sizes of aggregate to meet Tables 1005- 1 or 1005- 2. 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.
10-27 Property Test Met hod
Gradation AASHTO T 27 and T11, AASHTO T 88 as Modified f or Base Course and Stabilizer Liquid Limit AASHTO T 89 as Modified Plasticity Index AASHTO T Resistance to Abrasion (Percentage of Wear) AASHTO T Soundness AASHTO T 104 Using Sodium Sulfate Copies of modified test procedures are available from the Materials and Tests Unit . 10-28 Light - weightC ABC (M) ABC 9M 14M 78M 67 6M 57M 57 5 467M 4 Std. Size # Percentage of Total by Weight Passing TABLE 1005- AGGREGATE GRADATION - COARSE AGGREGATE
A.See Subarticle 1005 -4(A). B. See Subarticle 1005 -4(B). C. For Lightweight Aggregate used in Structural Concrete, see Subarticle 1014-2 (E)(6) - - - - - - - - - - - 100 100 2" - 100 100 - - - - - 100 100 100 95-100 90-100 1 1/2" - 75-100 75-97 - - - 100 100 95-100 95-100 90-100 - 20-55 1" - - - - - 100 90-100 90-100 - - 20-55 35-70 0-15 3/4" 100 45-79 55-80 100 100 98-100 - 20-55 25-45 25-60 0-10 - - 1/2" 80-100 - - 98-100 98-100 75-100 20-55 0-20 - - 0-5 0-30 0-5 3/8"
5-40 20-40 35-55 85-100 35-70 20-45 0-10 0-8 0-10 0-10 - 0-5 - #4
0-20 10-40 5-20 0-15 0-5 - 0-5 0-5 - - - #8
- 0-25 25-45 - - - - - - - - - - #10
0-10 0-10 0-8 - - - - - - - - #16
- - 14-30 - - - - - - - - - - #40
0-2.5 0-12b 4-12b A A A A A A A A A A #200
AST Maintenance Stabilization Aggregate Base Course, Aggregate Stabilization AST Asphalt Plant Mix, AST, Weep Hole Drains, Str. Concrete AST, Str. Conc., Weep Hole Drains, , Asphalt Plant Mix AST , Str. Concrete, Asphalt Plant Mix AST AST, Concrete Pavement AST, Str. Conc., Shoulder Drain, Sediment Control Stone AST, Sediment Control Stone Asphalt Plant Mix Asphalt Plant Mix Remarks
10-29 (A) When aggregate s 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:
1.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%.
2.When tested at the job site before use, the amount of material passing the No. 200 sieve shall:
a.Be no greater than 1.5% for aggregate used in Portland cement concrete or asphalt surface treatment.
b.Be no greater than 2.0% for aggregate used in asphalt plant mix.
3.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:
a.For aggregate used in Portland ce ment concrete, the total percentage by weight passing the No. 200 sieve in the combined coarse and fine aggregate in the mix does not exceed 3.5 %, and provided no increase in water -cement ratio is required by the use of this aggregate.
b.For aggregate used i n 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.
B.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 4. If PI exceeds 4 and is no more than 6, soil mortar limits apply. If PI exceeds 6, material sh all be rejected. 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 0-8A Concrete, Shotcrete, Grout, Subsurface Drainage 4S 100 95- 100 15- 45 0-10 0-5 Mortar
A.When tested at the job site before use, the amount of material passing the No. 200 sieve shall not be greater than 10% .
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 442–445 of 857.