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Binder Characterizations for High Tire Pressure Project. 04/26/2012 Injun Song , Ph.D., P. E . SRA International, Inc . Federal Aviation Administration  Airport Pavement Working Group Meeting Atlantic City Convention Center April 24 – 26, 2012 Atlantic City, NJ. Acknowledgements.

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Binder characterizations for high tire pressure project

Binder Characterizationsfor High Tire Pressure Project

04/26/2012

Injun Song, Ph.D., P. E.

SRA International, Inc.

Federal Aviation Administration Airport Pavement Working Group Meeting

Atlantic City Convention Center

April 24 – 26, 2012

Atlantic City, NJ


Acknowledgements
Acknowledgements

  • Binder Testing;

    • Yusuf A. Mehta, Rowan University.

  • APA Testing;

    • Jeff Stein, SRA International, Inc.

    • Matthew Wilson, SRA International, Inc.

  • Roy D. McQueen, Roy D. McQueen & Associates Ltd.

  • NavneetGarg, Federal Aviation Administration.

  • Gordon Hayhoe, Federal Aviation Administration.


Background
Background

  • Needs for New High Tire Pressure Limit;

    • The advent of new aircraft having tire pressures exceeding 220 psi,

    • International Civil Aviation Organization (ICAO) Standard.

  • New Design Procedures;

    • Concentrating in the surface layers of the pavement structure,

    • Developing Hot Mix Asphalt (HMA) mix design procedures.


Objectives
Objectives

  • Characterizations of the HMA properties affecting the performance of HMA mixes under high pressure aircraft tires;

    • Full-Scale testing at the National Airport Pavement Test Facility (NAPTF),

    • Laboratory testing for HMA and asphalt binder.

  • Conducting researches into the design of HMA to resist damage from high pressure aircraft tires.


Outline
Outline

  • Confirming Performance Grades.

  • Multi Stress Creep Recovery.

  • Frequency Sweep Test for Temperature Dependency.

  • Temperature Susceptibility for HMA.


Materials for lab testing
Materials for Lab Testing

  • Fifteen Mixtures Combining Three Aggregates with Five Binder Types.

  • Three Aggregate Types;

    • NAPTF mix (Argillite & Dolomite),

    • Lexington mix (Limestone),

    • JFK (Granite).

  • Five Binder Types;

    • Neat PG 64-22,

    • Neat PG 70-22,

    • Blend of Neat PG 64-28 + 25% Trinidad Lake Asphalt (TLA),

    • Polymer modified PG 76-22,

    • Polymer modified PG 82-22.


Naptf mixtures
NAPTF Mixtures

  • Used for NAPTF Full-Scale and Asphalt Pavement Analyzer (APA).

  • Mix Design;

    • Aggregates: Argillite and Dolomite,

    • Binder: PG 64-22 and PG 76-22 at 105°F and 119°F.

  • Loading Conditions;

    • Inflation pressure for the north wheel=210 psi / south wheel=245 psi,

    • Simulate Taxiway Traffic Loading: West to East at 1.0 ft/sec. Return East to West at 4.0 ft/sec,

    • Wander spacing=0 and ±7 inches / Wander sequence: -1, +1, 0.


Tests for binder characterization
Tests for Binder Characterization

  • Dynamic Shear Rheometer (DSR);

    • G*, d,

    • Multiple Stress Creep Recovery (MSCR),

    • AASHTO T 315; Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR),

    • AASHTO TP 70; Multiple Stress Creep Recovery (MSCR) Test of Asphalt Binder Using a Dynamic Shear Rheometer,

    • AASHTO M320; Standard Specification for Performance-Graded Asphalt Binder.

  • Rolling Thin Film Oven (RTFO).

  • Pressure Aging Vessel (PAV).

  • Rotational Viscometer.

  • Softening Point / Elastic Recovery (PG+).


Superpave performance grade
Superpave Performance Grade


Superpave pg high temperature
Superpave PG High Temperature

  • G*/ sin d;

  • >1.00 kPa for unaged.

  • >2.20 kPa after RTFO for production process during storing, mixing, transportation, and lay down,

  • SuperpaveBinder Specification inversely proportional to rutting potential,

  • Well for conventional speed and moderate traffic volume.

  • Grade Bumping;

  • Losing linear viscoelastic behavior with excessive loading time (speed) and heavy traffic (volume),


Faa grade bumping
FAA Grade Bumping

  • FAA Advisory Circular 150/5370-10F;


Aashto grade bumping
AASHTO Grade Bumping

  • AASHTO MP-2, “Standard Specification for Superpave Volumetric Mix Design”;


Multi stress creep recovery
Multi Stress Creep Recovery

  • Eliminate Grade Bumping;

    • Grade bumping not reflects experiencing high temperature.

  • Better Characterization of the High Temperature Performance Properties.

  • Testing;

    • DSR after Short-Term Aging (RTFO),

    • 10 cycles per stress level at 0.1kPa and 3.2kPa,

    • 1 second loading and 9 second resting periods,

    • Non-Recoverable Creep Compliance ().


Mscr gradings
MSCR Gradings()

  • ) / ≤ 0.75


Mscr gradings traffic
MSCR Gradings (Traffic)

  • Example; NJ 20mil ESAL, PG 64-22

→ PG 64-22V


Mscr gradings results
MSCR Gradings (Results)







Summary
Summary

  • Binder Characterizations;

    • Confirming current binder gradings used for high tire pressure project,

    • Applications of MSCR for the current binders.

  • Temperature Susceptibilities for Binder and HMA.



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