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Asphalt Rubber Related Specifications. Arizona Department of Transportation. Section 1009. Asphalt-Rubber Material. 1009-2.01 Asphalt Rubber. Asphalt cement shall be PG Type 1: PG 64-16 Desert Type 2: PG 58-22 Mid-zone Type 3: PG 52-28 Alpine Rubber

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asphalt rubber related specifications

Asphalt Rubber Related Specifications

Arizona Department of Transportation

section 1009

Section 1009

Asphalt-Rubber Material

1009 2 01 asphalt rubber
1009-2.01 Asphalt Rubber
  • Asphalt cement shall be PG
    • Type 1: PG 64-16 Desert
    • Type 2: PG 58-22 Mid-zone
    • Type 3: PG 52-28 Alpine
  • Rubber
    • Type A Spray Application
    • Type B Hot Mix
1009 2 02 ar proportions
1009-2.02 AR Proportions
  • Minimum 20% ground rubber by weight of the asphalt cement
  • 23.5% rubber means for every 100 lbs of asphalt cement there is 23.5 lbs of rubber (this is the same as 19% by weight of the binder)
1009 3 01 mixing of ar
1009-3.01 Mixing of AR
  • Asphalt Cement 350-400°F at time of addition of ground rubber
  • After mixing, maintain at 325-375°F for one hour
  • Before using, test viscosity with rotational viscometer (furnished by contractor/supplier)
1009 3 02 handling of ar
1009-3.02 Handling of AR
  • Keep thoroughly agitated
  • 325-375°F during production of mix
  • Maximum holding time 10 hours above 325°F
  • Cooling and reheating allowed one time
  • Maximum four days held above 250°F
1009 3 02 handling of ar cont
1009-3.02 Handling of AR (cont)
  • Required Documentation:
    • Asphalt Cement source, grade, amount, and temperature prior to addition of rubber
    • Amount and source of added rubber
    • Rubber content as percent by weight of asphalt cement
    • Time/date of rubber addition and viscosities
    • Record of temperature changes
section 414

Section 414

Asphalt Rubber - Asphaltic Concrete Friction Course

414 4 mix design
414-4 Mix Design
  • Done at ADOT’s Central Lab
  • Within 10 working days of receiving all samples and the contractors letter at Central Lab
414 5 mix design revisions
414-5 Mix Design Revisions
  • Changes in mineral aggregate, bituminous materials, or proportions require approval of the Engineer
  • After development of acceptable mix design, costs associated with development of new design borne by the contractor
414 6 02 mineral aggregate acceptance
414-6.02 Mineral Aggregate Acceptance
  • Daily sample from each stockpile
  • Gradation
  • Composited material tested for
    • sand equivalent
    • fractured coarse aggregate particles
    • flakiness
414 6 03b ar content
414-6.03B AR Content
  • Contractor required to supply nuclear gauge at the plant site
  • Asphalt-rubber content measured a minimum of four time per shift
414 7 05 mixing
414-7.05 Mixing
  • Discharge temperature shall not exceed 350° F
414 7 06 placing and finishing
414-7.06 Placing and Finishing
  • Seasonal dates a function of location
  • Surface temperature at least 85°F
  • Even if temperature 85°F, Engineer can adjust work hours depending on weather forecast
414 7 08 compaction
414-7.08 Compaction
  • Prior to compaction, mix minimum of 275°F
  • Minimum three static steel wheel compactors
  • Minimum two initial breakdown compactors
  • Final compaction above 220°F