815Graded Aggregate

815.1General Description

This section includes the requirements for material to be used for base, subbase, or shoulder course material, and includes graded aggregate, unconsolidated limerock base, and recycled concrete base. 815.1.01 Related References

AASHTO T 11 AASHTO T 27 AASHTO T 193 ASTM C 295 ASTM D 3042 FL DOT Method FM5-515 SOP–1 QPL-2 GDT 63 EPA Method 3050/6010 EPA Method 1311 EPA Polarized Light Microscopy Method EPA Transmission Electron Microscopy Method

815.2Materials

815.2.01 Graded Aggregate

Type Use graded aggregate base, subbase, or shoulder course material of uniform quality.

meeting all requirements of this specification.

material so that when combined in the central mix plant, the mixture meets the specifications.

sources (see 815.2.03.A.1.a) and virgin aggregate if approved by the Office of Materials and Testing. Retained on the No. 10 (2 mm) sieve Ensure the material retained on the No. 10 (2 mm) sieve is Class A or B aggregate that meets the requirements of Section 800. 1490 1490 1490

Passing the No. 10 (2 mm) sieve Ensure material passing the No. 10 (2 mm) sieve is relatively free of detrimental substances, such as soil overburden, decomposed rock, and/or swelling silts. Stabilized Mixtures Ensure mixtures to be stabilized react satisfactorily when mixed with Portland cement. The Engineer will specify the percentage of Portland cement to use. Gradation Grade the graded aggregate base, subbase, or shoulder material as follows: Sieve Size Percent Passing By Weight Group I Aggregates 2 in. (50 mm) 100 1-1/2 in. (37.5 mm) 95-100 3/4 in. (19.0 mm) 60-95 No. 10 (2 mm) 25-50 (Note 1, 2 and 3) No. 60 (250 µm) 10-35 No. 200 (75 µm) 7-15 Group II Aggregates 2 in. (50 mm) 100 1-1/2 in. (37.5 mm) 95-100 3/4 in. (19 mm) 60-90 No. 10 (2 mm) 25-45 (Note 2 and 4) No. 60 (250 µm) 5-30 No. 200 (75 µm) 4-11 NOTE 1: Group I aggregates having less than 37% passing the No. 10 (2 mm) sieve, shall have at least 9 percent passing the No. 200 (75 µm) sieve. NOTE 2: For graded aggregate stabilized with Portland Cement, 30-50 percent by weight shall pass the No. 10 (2 mm) sieve. All other requirements remain the same. NOTE 3: Material passing the No. 10 (2 mm) sieve shall have a sand equivalent of at least 20 for Group I aggregates. NOTE 4: Material passing the No. 10 (2 mm) sieve shall have a sand equivalent of at least 28 for Group II aggregates. Sand Equivalent values as low as 20 will be acceptable provided they are attributed exclusively to rock flour and the percent passing the No. 10 (2 mm) sieve does not exceed 40.

General Provisions 101 through 150.

Test as follows: 1491 1491 1491

Test Method Material that passes a No. 200 (75µm) sieve AASHTO T 11 Gradation AASHTO T 27 Sand Equivalent GDT 63

General Provisions 101 through 150. 815.2.02 Unconsolidated Limerock Base

Type Use limerock base, subbase, or shoulder course material of uniform quality.

processes at a specific mining site, or both.

material so that when combined in the central mix plant the mixture meets the specifications.

Limerock bearing ratio At least 100. Deleterious substances Do not allow chert or other extremely hard pieces that will not pass the 2 in. (50 mm) sieve. Do not allow clay, sand, organics, or other materials in quantities that may damage bonding, finishing, or strength. All material passing the No. 40 (425 µm) sieve shall be non-plastic. Carbonate content (magnesium or calcium) At least 80%. Gradation Grade the limerock base so at least 97 percent by weight passes the 3-1/2 in. (90 mm) sieve.

of fracture.

the road.

gradation requirements: 1492 1492 1492

GRADATION REQUIREMENTS Sieve Size Percent Passing By Weight 2 in. (50 mm) 100 1-1/2 in. (37.5 mm) 95-100 ¾ in. (19 mm) 60-95 No. 10 (2.00 mm) 25-45 No. 60 (250 µm) 10-30 No. 200 (75 µm) 7-20

General Provisions 101 through 150.

Test as follows: Test Method Material that passes a No. 200 (75µm) sieve AASHTO T 11 Gradation AASHTO T 27 Limerock bearing ratio FL DOT Method FM5-515 Petrographic analysis ASTM C 295 Total carbonates (insoluble residue) ASTM D 3042

General Provisions 101 through 150. 815.2.03 Recycled Concrete Base

Sources Use recycled concrete materials from sources approved by the Office of Materials and Testing and listed on Qualified Products List 2. The criteria for approval will be as outlined in Standard Operating Procedure No. 1, “Monitoring the Quality of Coarse and Fine Aggregates” except the raw material will be recyclable concrete as specified herein rather than a geological deposit of aggregate. Type

Use recycled concrete derived exclusively from Portland cement concrete pavement or structural concrete as a base, subbase, or shoulder course. 1493 1493 1493

Use recycled concrete derived from sources of demolition materials that comply with the following requirements as a base, subbase or shoulder course. Due to the condition and type of raw material used to produce this base and the resulting difficulty in producing a consistent product, refer to SOP-1 for environmental requirements and preferred production procedures. Ensure the finished product does not exceed the regulatory limit for asbestos of 1 percent (based on microscopy) and the regulatory limit for lead of 5 ppm. These determinations must be made prior to shipping. Ensure the California Bearing Ratio (CBR) of the finished product is not less than 140. Gradation and Load-Bearing Capacity Ensure the finished product meets the quality and gradation requirements of Subsection 815.2.01 for Group II aggregates, except the material finer than a #200 (75µm) sieve shall be 2 – 11 percent. Ensure the California Bearing Ratio (CBR) of the finished product is not less than 140. Contaminants Ensure the recycled concrete is substantially free of foreign materials such as steel reinforcement, wood, clay balls, soils, epoxy expansion material and non-construction materials. Note – Substantially free, in the context of this specification, shall mean concentrations of the above- mentioned foreign materials individually shall not exceed 0.1 percent by weight, nor shall the total concentration of these materials exceed 0.5 percent by weight. Ensure the finished product does not exceed the regulatory limit for asbestos of 1% (based on microscopy) and the regulatory limit for lead of 5 ppm. Keep the following ancillary materials within these limits: Substance Maximum Percent by Weight Brick 2 Asphaltic Concrete 5 Weathered Rock 2 Any combination of Brick, Asphaltic Concrete or Weathered Rock

General Provisions 101 through 150. 1494 1494 1494

Test as follows: Test Method Gradation AASHTO T 27 Material that passes a #200 (75µm) sieve AASHTO T 11 Sand Equivalent GDT 63 California Bearing Ratio (CBR) AASHTO T 193 Petrographic Analysis ASTM C 295 Total Lead EPA Method 3050/6010 Toxicity Characteristic Leaching Procedure EPA Method 1311 Asbestos EPA Polarized Light Microscopy Method or EPA Transmission Electron Microscopy Method

General Provisions 101 through 150. 1495 1495 1495