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

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* Conventional Materials – Initial Construction*

*Projects constructed in Arizona


Outline2
Outline Conventional Materials – Initial Construction*

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Project layout
Project Layout Conventional Materials – Initial Construction*


Standard sections
Standard Sections Conventional Materials – Initial Construction*


Scope of work
Scope of Work Conventional Materials – Initial Construction*

  • 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
Standard Section Conventional Materials – Initial Construction*


Outline3
Outline Conventional Materials – Initial Construction*

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Alligator cracking
Alligator Cracking Conventional Materials – Initial Construction*

Moderate severity alligator cracking Existing pavement prior to rehabilitation


Transverse cracking
Transverse Cracking Conventional Materials – Initial Construction*

Slight to moderate severity transverse cracking Existing pavement prior to rehabilitation


Block cracking
Block Cracking Conventional Materials – Initial Construction*

Block cracking

Existing pavement prior to rehabilitation

Maybe considered combination of longitudinal and transverse cracking


Outline4
Outline Conventional Materials – Initial Construction*

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Cold milling operations
Cold Milling Operations Conventional Materials – Initial Construction*


Unprocessed rap from i 19
Unprocessed RAP from I-19 Conventional Materials – Initial Construction*


Coarse rap 3 4 in x 3 8 in
Coarse RAP (3/4-in x 3/8-in) Conventional Materials – Initial Construction*


Fine rap 3 8 in minus
Fine RAP (3/8-in Minus) Conventional Materials – Initial Construction*


Hot plant feeders
Hot Plant Feeders Conventional Materials – Initial Construction*

5 Virgin Aggregate Bins

2 RAP Bins


Hot plant
Hot Plant Conventional Materials – Initial Construction*

Cement Silo and Pugmill

Virgin Aggregate Scalping Screen


Hot plant1
Hot Plant Conventional Materials – Initial Construction*

Counter Flow Drum Mixer

RAP Conveyor


Paving and inspection
Paving and Inspection Conventional Materials – Initial Construction*

HMA Paving

Density Testing


Rolling operations
Rolling Operations Conventional Materials – Initial Construction*

Echelon Breakdown Rolling

Finish Rolling


Finished mat
Finished Mat Conventional Materials – Initial Construction*


Outline5
Outline Conventional Materials – Initial Construction*

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Granite test results rap
Granite Test Results – RAP* Conventional Materials – Initial Construction*

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


Granite test results rap1
Granite Test Results – RAP* Conventional Materials – Initial Construction*

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


Granite adot test results gradation
Granite/ADOT Test Results - Gradation Conventional Materials – Initial Construction*

  • Gradation of aggregate extracted from field mixed samples

*Standard Deviation – measure of variability


Granite adot test results volumetrics
Granite/ADOT Test Results - Volumetrics Conventional Materials – Initial Construction*

  • Volumetric properties of field mixed/lab compacted samples

*Standard Deviation – measure of variability


Outline6
Outline Conventional Materials – Initial Construction*

  • Introduction

  • Project Overview

  • Existing Pavement Condition

  • Construction and Production Operations

  • Granite/ADOT Test Results

  • Summary


Recycling benefits
Recycling Benefits Conventional Materials – Initial Construction*

  • 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
Questions Conventional Materials – Initial Construction*


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