800Coarse Aggregate

800.1 General Description

This section includes requirements for coarse aggregate. All aggregate shall be the specified type, class, and grade, and shall meet the requirements for the intended use.

800.1.01 Related References

A. Standard Specifications Section 424—Bituminous Surface Treatment B. Referenced Documents AASHTO ASTM T 11 T 27 T 96 T 104 T 303 C 295 E 30 G 23 GDT 104 GDT 129 GDT 133 QPL 2 SOP 1

800.2 Materials

800.2.01 Coarse Aggregate

A. Requirements The Contractor shall use the type, group, class, and grade of coarse aggregate specified. For coarse aggregate sources, see QPL 2. 1. Coarse Aggregate Types Type Characteristics Crushed stone Sound, durable rock particles. Gravel Sound, durable rock without damaging coatings. Air-cooled blast furnace slag Sound, durable particles with uniform density and quality, or other slags that have a good service record. Dry slag shall weigh at least 70 lb./ft.³ (1120 kg/m³) compacted and shall contain less than 30% glassy particles by weight. Do not use slag as aggregate for Portland cement concrete. Synthetic aggregate Sound, durable, expanded clay, shale, or other manufactured product. 2. Coarse Aggregate Groups a. Group I: Limestone, dolomite, marble, or any combination thereof. Ensure Group I aggregates meet the abrasion requirement for Class A stone when used in Portland cement concrete of any type or class. b. Group II: Slag, gravel, granitic and gneissic rocks, quartzite, synthetic aggregate, or any combination thereof. 3. Classes Aggregates are classified by physical properties that determine how they are used. a. Do not blend aggregates that meet abrasion requirements with aggregates that do not meet requirements from different sources as listed on the Qualified Products List. b. “Class A” and “Class B” aggregate used in Portland cement concrete, asphaltic concrete, and bituminous surface treatment shall meet these limits: Percent Wear AASHTO T 96 (“B” Grading) Class A Class B Group I Aggregates 0-40 41-55 Group II Aggregates 0-50 51-60 c. “Class B” aggregates used in all applications other than Portland cement concrete, asphaltic concrete, or bituminous surface treatment shall meet these limits: Percent Wear AASHTO T 96 (“B” Grading) Class B Group I Aggregates 41-55 Group II Aggregates 51-65 4. Soundness Test coarse aggregate used in Portland cement concrete, bituminous surfaces, bituminous bases, aggregate bases, or surface treatment with five alternations of the magnesium sulfate soundness test. a. Use aggregate with a weight loss of less than 15 percent. b. The 15 percent soundness loss for a Class “CS” concrete is waived if it has a 5-year service record. c. If the material meets all the requirements except for the 15 percent soundness requirement, the material may be used in Zones 3 and 4 (see Subsection 424.3.05, Construction Requirements) under the following conditions: 1) The aggregate in bituminous courses and in all types and classes of Portland cement concrete construction, except as stated in Group I, has a satisfactory five-year service record under similar service and exposure. 2) The Engineer’s investigation shows that it equals or exceeds the quality of approved aggregate (in cases where the material’s uniformity changes at the source or does not have a five-year service record). 5. Grades Use coarse aggregate that is well graded within the limits and sizes specified in Table 800.1. 6. Detrimental Substances a. Detrimental substances include shale, weathered or decomposed rock, friable particles, or any substance that may be detrimental for the use intended. b. Do not use any aggregate that can cause a deleterious reaction. c. Do not use aggregates that contain Chrysotile (defined as fibrous serpentinite) as a temporary or permanent unbound surfacing for roads, nor as stabilizer for soil used as subgrade, base, or surface course. d. Detrimental substances shall not exceed the following limits: 1) For Portland Cement Concrete: Substance Max % Allowed Mica schist—Materials defined in ASTM C 294 as phyllite or schist. Use GDT 104 to analyze these materials. Materials that pass the No. 200 (75 µm) sieve. 1.5 Flat and elongated pieces (with lengths more than five times the average thickness). 10 Sulphur content computed as sulfide sulphur (for bridge-type structures)—If the sulphur content exceeds 0.01%, do not use the aggregate unless it passes a petrographic analysis and a weathering test equivalent to 6 months or more of exposure. 0.01 Other local detrimental substances. (Any Combination) 2.0 NOTE: Do not use aggregate in Portland Cement concrete that is capable of producing a deleterious reaction when combined with Portland Cement. 2) For Asphaltic Concrete: Substance Max. % Allowed Mica schist—Materials defined in ASTM C 294 as phyllite or schist. Use GDT 104 to analyze these materials. (Use this requirement for Interstate Construction, SMA mixes, OGFC mixes and all surface mixes on roadways ≥ 25,000 ADT). Flat or elongated particles (with lengths more than five times the average thickness). 10 Glassy particles (slag). 30 Other local detrimental substances. (Any combination) 2.0 3) For Bituminous Surface Treatment: Substance Max. % Allowed Mica schist—Materials defined in ASTM C 294 as phyllite or schist. Use GDT 104 to analyze these materials. Material finer than No. 200 (75 µm) sieve. #5 Stone #6 Stone #7 Stone #89 Stone 0.5 0.7 0.7 1.0 Flat and elongated particles (with lengths more than five times the average thickness). 10 Glassy particles (slag). 30 Other local detrimental substances. (Any combination) 2 7. Ensure that gravel used in Asphaltic Concrete and Bituminous Surface Treatment meets the following additional requirements: • Consists of siliceous particles. • A minimum of 85 percent, by count, of the material retained on the No. 4 (4.75 mm) sieve has one or more fractured faces. • The fracture is for the approximate average diameter or thickness of the particle. 8. Ensure that No. 7 stone used in Bituminous Surface Treatment meets the following gradation: ¾ in. (19 mm) ½ in. (12.5 mm) 3/8 in. (9.5 mm) No. 4 (4.75 mm) No. 8 (2.36 mm) 100 85-100 40-70 0-15 0-5 B. Fabrication General Provisions 101 through 150. C. Acceptance Test as follows: Test Method Material that passes the No. 200 (75 µm) sieve AASHTO T 11 Sulphur content ASTM E 30, Leco method Weathering ASTM G 23 Petrographic analysis ASTM C 295 Soundness (magnesium sulfate) AASHTO T 104 Percent wear AASHTO T 96 Aggregate gradation AASHTO T 27 Reactivity AASHTO T 303 Schist or phyllite GDT 104 Flat and elongated particles GDT 129 Friable Particles GDT 133 D. Materials Warranty General Provisions 101 through 150. TABLE 800.1 - SIZES OF COARSE AGGREGATES SIZE NO NOMINAL SIZE SQUARE OPENINGS AMOUNTS FINER THAN EACH LABORATORY SIEVE (SQUARE OPENINGS). %, BY WEIGHT

Coarse Aggregate in other states

• Alabama 801 · COARSE AGGREGATE
• Florida 901 · COARSE AGGREGATE
• Virginia 203 · Coarse Aggregate
• West Virginia 703 · Coarse Aggregate