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R eclaimed A sphalt P avement in Arizona - Application and Verification. October 3, 2008 Arizona Association of County Engineers. Outline. Introduction Project Overview Existing Pavement Condition Construction and Production Operations Granite/ADOT Test Results Summary. Outline.

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r eclaimed a sphalt p avement in arizona application and verification

Reclaimed Asphalt Pavement in Arizona - Application and Verification

October 3, 2008

Arizona Association of County Engineers

outline
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
outline1
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
changing market conditions renewed interest in recycling
Changing Market Conditions = Renewed Interest in Recycling
  • Price escalation for construction/rehabilitation and maintenance
  • Asphalt binder shortages
  • Polymer shortages
  • Environmental concerns
  • Energy concerns
  • Funding limitations
states allowance of rap
States Allowance of RAP
  • 75-percent of States allow at least 10-percent RAP in surface course mixes
  • More States allow higher percentages in lower lifts
value of recycling percent savings relative to conventional materials initial construction
Value of Recycling – Percent Savings Relative to Conventional Materials – Initial Construction*

*equivalent square yardsNote: Similar advantages found with Life Cycle Cost

pci over time
PCI Over Time*

*Projects constructed in Arizona

outline2
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
scope of work
Scope of Work
  • Partial depth removal of existing asphalt concrete
  • Placement of dense grade asphalt concrete
  • Placement of AR-ACFC
  • Miscellaneous other work
  • Granite’s Proposal
    • Use RAP in base course HMA
      • 6% coarse RAP (3/4-in x 3/8-in)
      • 9% fine RAP (3/8-in minus)
    • Note: RAP currently used as shoulder backing and aggregate base on ADOT projects
outline3
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
alligator cracking
Alligator Cracking

Moderate severity alligator cracking Existing pavement prior to rehabilitation

transverse cracking
Transverse Cracking

Slight to moderate severity transverse cracking Existing pavement prior to rehabilitation

block cracking
Block Cracking

Block cracking

Existing pavement prior to rehabilitation

Maybe considered combination of longitudinal and transverse cracking

outline4
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
hot plant feeders
Hot Plant Feeders

5 Virgin Aggregate Bins

2 RAP Bins

hot plant
Hot Plant

Cement Silo and Pugmill

Virgin Aggregate Scalping Screen

hot plant1
Hot Plant

Counter Flow Drum Mixer

RAP Conveyor

paving and inspection
Paving and Inspection

HMA Paving

Density Testing

rolling operations
Rolling Operations

Echelon Breakdown Rolling

Finish Rolling

outline5
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
granite test results rap
Granite Test Results – RAP*

*Test results based on ignition oven**Standard Deviation – measure of variability

granite test results rap1
Granite Test Results – RAP*

*Test results based on solvent extraction**Standard Deviation – measure of variability

granite adot test results gradation
Granite/ADOT Test Results - Gradation
  • Gradation of aggregate extracted from field mixed samples

*Standard Deviation – measure of variability

granite adot test results volumetrics
Granite/ADOT Test Results - Volumetrics
  • Volumetric properties of field mixed/lab compacted samples

*Standard Deviation – measure of variability

outline6
Outline
  • Introduction
  • Project Overview
  • Existing Pavement Condition
  • Construction and Production Operations
  • Granite/ADOT Test Results
  • Summary
recycling benefits
Recycling Benefits
  • Conservation
    • Materials (aggregate and asphalt binder)
    • Energy (burner fuel, trucking, etc.)
  • Preservation of environment
    • Landfill
    • Green house gases (global warming)
    • Sustainability
  • Economics
    • Reduce first and life cycle cost
    • Complete reconstruction vs. alternative methods
    • Increased contractor competition
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