SECTION 203—COARSE AGGREGATE
203.01 Description
These specifications cover material used as coarse aggregate in the production of hydraulic cement concrete, asphalt concrete, asphalt surface treatments, and in drainage.
203.02 Materials
Coarse aggregate shall consist of crushed stone, crushed slag, crushed or uncrushed gravel with clean, hard, tough, and durable pieces free from adherent coatings and deleterious amounts of friable, thin, elongated, or laminated pieces; soluble salts; or organic materials.
a.Crushed hydraulic cement concrete will be permitted for use as a coarse aggregate provided it conforms to the physical requirements specified herein and shows no adverse chemical reaction. Crushed hydraulic cement concrete will not be permitted in the following: (1) reinforced cement concrete, (2) in combination with other materials in contact with geotextile fabric when such fabric is used as a drainage item, and (3) in backfill or bedding for perforated pipe.
b.Crushed gravel shall consist of particles of which at least 80 percent by weight shall have at least one face fractured by artificial crushing. Tests to verify conformance shall be performed in accor - dance with VTM-15.
c.Blast furnace slag shall be relatively free from foreign minerals and glassy or spongy pieces. It shall weigh at least 70 pounds per cubic foot, dry rodded, for size No. 68 and smaller and at least 65 pounds per cubic foot, dry rodded, for larger sizes. T ests to verify conformance shall be performed in accordance with AASHTO T19. When used in asphalt surface treatments, blast furnace slag shall contain not more than 10 percent nonporous material and shall have an absorption of at least 3 percent. T ests to verify conformance will be performed in accordance with AASHTO T85.
d.Crushed glass shall consist of particles of curbside-collected or waste glass. It shall be free from sources of glass that include automotive glass, lead crystal, TV monitors, lighting fixtures and electronics applications. Non-glassy material associated with curbside collection (paper, capping materials, etc.), excluding fragments of broken ceramics and pottery, shall be limited to 5 percent by weight using a gravimetric determination, and including loss on ignition performed in accordance with ASTM D2974. One hundred percent (100%) of the crushed glass shall pass the 9.5 mm (3/8 inch) sieve with less than 5 percent passing the No. 200 sieve. Crushed glass shall not be used in hydraulic cement concrete, asphalt, base/subbase, or exposed shoulder applications. 202.03 203.03 Amounts Finer Than Each Laboratory Sieve (Square Openings) (% by Weight)Va. Size 4 in. 3½ in. 3 in. 2½ in. 2 in. 1½ in. 1 in. 3/4 in. 1/2 in. 3/8 in. No. 4 No. 8 No. 16 No. 50 No. 100 No. 1 Min. 100 90-100 25-60 Max. 15 Max. 5 2 Min. 100 90-100 35-70 Max. 15 Max. 5 3 Min. 100 90-100 35-70 0-15 Max. 5 357 Min. 100 95-100 35-70 10-30 Max. 5 5 Min. 100 90-100 20-55 Max. 10 Max. 5 56 Min. 100 90-100 40-85 10-40 Max. 15 Max. 5 57 Min. 100 95-100 25-60 Max. 10 Max. 5 67 Min. 100 90-100 20-55 Max. 10 Max. 5 68 Min. 100 90-100 30-65 5-25 Max. 10 Max. 5 7 Min. 100 90-100 40-70 Max. 15 Max. 5 78 Min. 100 90-100 40-75 5-25 Max. 10 Max. 5 8 Min. 100 85-100 10-30 Max. 10 Max. 5 8P Min. 100 75-100 5-30 Max. 5 9 Min. 100 85-100 10-40 Max. 10 Max. 5 10 Min. 100 85-100 10-30 TABLE II-3 Sizes of Open-Graded Coarse Aggregates 203.03 TABLE II-4 Soundness Max. Soundness Loss (%) Magnesium Sulphate Freeze and Thaw Use (5 Cycles) (100 Cycles) Hydraulic cement concrete 12 5 Asphalt surfaces courses 15 6 Asphalt and aggregate bases 20 7 Select material (T ype I) and subbase 30 12
203.03 Detail Requirements
a.Grading: Open-graded aggregates shall conform to the requirements of Table II-3. Tests to verify conformance shall be performed in accordance with AASHTO T27.
b.Soundness: Soundness shall conform to the requirements of Table II-4. Tests to verify conformance shall be performed in accordance with AASHTO T103 or T104. The requirement for soundness test for crushed glass is waived due to its preclusion from the applications shown in Table II-4.
c.Abrasion Loss: Abrasion loss shall conform to the requirements of Table II-5. Tests to verify conformance shall be performed in accordance with AASHTO T96 on aggregate with a grading the most nearly identical with the grading to be used in the work.
d.Deleterious Material: The amount of deleterious material shall be not more than the following: Material % by Weight AASHTO Test Method ————————————————————————————————————— Coal and lignite 0.25 T113 Clay lumps 0.25 T112 Material passing No. 200 sieve by washing1 1.00 T11 1When the material passing the No. 200 sieve by washing is dust of fracture, the percentage of deleterious material may be increased to 1.50 percent. —————————————————————————————————————
e.Flat and Elongated Particles: Coarse aggregate to be used as a temporary riding surface during construction activities or as the final riding surface after construction shall contain not more than 30 percent by mass of aggregate particles retained on and above the 3/8-inch sieve having a maximum to minimum dimensional ratio greater than 5 as determined in accordance with ASTM D4791. TABLE II-5 Abrasion Max. Los Angeles Abrasion Loss (%) Use 100 Rev. 500 Rev. Grade A stone 9 40 Grade B stone 12 45 Grade C stone 14 50 Slag 12 45 Gravel 12 45
Referenced in this section
Coarse Aggregate in other states
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Source: Road and Bridge Specifications, 2020 Edition. Pages 174–176 of 1,065. View official source ↗