829.1 General Description
This section specifies the requirements for ground tire rubber (GTR).
829.1.01 Definitions
Ground Tire Rubber: Recycled tire rubber which has been ground into very small particles to use as an asphalt cement or asphaltic concrete modifier.
829.1.02 Related References
A. Standard Specifications Section 820–Asphalt Cement B. Referenced Documents ASTM E105 ASTM E122 ASTM D5603 ASTM D5644 ASTM D1509 ASTM M17 ASTM D297
829.2 Material Requirements
829.2.1 General
Ensure the GTR, used in Asphalt Rubber Binder, is produced from tires and is substantially free from contaminates including fabric, metal, mineral and other non-rubber substances. Ensure the GTR is sufficiently dry so that it is free flowing and does not foam when mixed with the asphalt cement.
829.2.2 Physical Requirement
Ensure the physical properties of GTR complies with the specified testing and material requirements in Table 1. TABLE 1 – PHYSICAL TESTING AND MATERIAL REQUIREMENTS FOR GTR Test Description Test Method Specification Requirement GTR Sampling ASTM E105 and ASTM E122 Random Sampling Procedures GTR Source ASTM D5603 Cryogenic or Ambient Ground GTR Specific Gravity ASTM D5603 1.02 to 1.20 Gradation ASTM D5603 ASTM D5644 ≥ 98 % Passing No. 30 Sieve Metal Contaminates ASTM D5603 ≤ 0.01 % Fiber Content ASTM D5603 ≤ 0.50 % Moisture Content ASTM D1509 ≤ 0.75 % Test Description Test Method Specification Requirement Mineral Filler – Talcum Powder (Optional Dusting Agent) ASTM M17 ≤ 4.0 % Workability Additives Laboratory and Field Trials Dosage Rate OMAT Approval Required
829.2.3 Chemical Requirements
Ensure the chemical properties of GTR complies with the specified testing and material requirements in Table 2. TABLE 2 – CHEMICAL TESTING AND MATERIAL REQUIREMENTS FOR GTR Test Description Test Method Specification Requirement Acetone Extract ASTM D297 ≤ 25.0 % Rubber Hydro Carbon Content ASTM D297 40.0 – 60.0 % Ash Content ASTM D297 ≤ 8.0 % Carbon Black Content ASTM D297 20.0 – 40.0 % Natural Rubber ASTM D297 16.0 - 45.0 %
829.2.4 Delivery, Storage, and Handling
A. Packaging and Identification Requirements Ensure the GTR is supplied in moisture proof packaging in disposable bags or other appropriate bulk containers. Each bag or container shall be properly labeled with the manufacturer’s designation for the GTR and specific type, mesh size, weight and manufacturer’s batch or Lot designation.
829.2.5 Submittals
A. Invoices Furnish formal written invoices from the supplier for all GTR used in the production of Asphalt Rubber Binder. Show the following on the Bill of Lading: Supplier name, location and product name Date shipped Quantities in pounds or tons Included with or without workability additive(s)
829.2.6 Materials Warranty
General Provisions 101 through 150.
Ground Tire Rubber in other states
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