R eclaimed a sphalt p avement in arizona application and verification
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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

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Reclaimed Asphalt Pavement 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

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Change in DOT’s


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

  • 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*

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


PCI Over Time*

*Projects constructed in Arizona


Outline

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Project Layout


Standard Sections


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


Standard Section


Outline

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Alligator Cracking

Moderate severity alligator cracking Existing pavement prior to rehabilitation


Transverse Cracking

Slight to moderate severity transverse cracking Existing pavement prior to rehabilitation


Block Cracking

Block cracking

Existing pavement prior to rehabilitation

Maybe considered combination of longitudinal and transverse cracking


Outline

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Cold Milling Operations


Unprocessed RAP from I-19


Coarse RAP (3/4-in x 3/8-in)


Fine RAP (3/8-in Minus)


Hot Plant Feeders

5 Virgin Aggregate Bins

2 RAP Bins


Hot Plant

Cement Silo and Pugmill

Virgin Aggregate Scalping Screen


Hot Plant

Counter Flow Drum Mixer

RAP Conveyor


Paving and Inspection

HMA Paving

Density Testing


Rolling Operations

Echelon Breakdown Rolling

Finish Rolling


Finished Mat


Outline

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Granite Test Results – RAP*

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


Granite Test Results – RAP*

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


Granite/ADOT Test Results - Gradation

  • Gradation of aggregate extracted from field mixed samples

*Standard Deviation – measure of variability


Granite/ADOT Test Results - Volumetrics

  • Volumetric properties of field mixed/lab compacted samples

*Standard Deviation – measure of variability


Outline

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


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


Questions


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