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Asphalt Shingles in HMA Missouri DOT Experience. North Central HMA Conference Joe Schroer, PE January 10, 2007. In The Beginning. Approached by Pace Construction and Peerless Landfill MoDOT Not Using RAP in Mixtures Deleterious Material Stiffness of Asphalt in Shingles.

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Asphalt shingles in hma missouri dot experience

Asphalt Shingles in HMAMissouri DOT Experience

North Central HMA Conference

Joe Schroer, PE

January 10, 2007


In the beginning
In The Beginning

  • Approached by Pace Construction and Peerless Landfill

    • MoDOT Not Using RAP in Mixtures

    • Deleterious Material

    • Stiffness of Asphalt in Shingles


First look the ex factor
First LookThe “Ex” Factor

  • Exhaustive Literature Search

  • Exclusion of Tear Offs in States Allowing Manufacturing Waste

  • Extra Clean Material – Contained Little Deleterious Matter

  • Exceptionally Stiff Asphalt Extracted from Shingles


Shingle components
Shingle Components

  • Asphalt  20%-40%

    • Stiffen Roadway Asphalt

  • Aggregate  30%

    • Good Stuff

  • Fiberglass or Paper Mat  30%

    • No Harm if Well Dispersed


Modot goals
MoDOT Goals

  • Engineering Properties First

    • Harmful Effects of Deleterious Material

    • Asphalt Binder Properties

  • Traffic Safety – Nails, etc.

  • If Everything Else Works Out, Landfilling is Reduced


Why should we pursue shingles
Why Should We Pursue Shingles?

  • High Asphalt Content

  • Granules Are Hard and Durable

  • Recycling

CO$T


Concerns
Concerns

  • How Will Deleterious Material Affect the Mixture

  • Can the Low Temperature Grading be Maintained at Various Blending Ratios


Asphalt after blending with shingle asphalt
Asphalt After Blending with Shingle Asphalt

  • Resist Rutting

  • Resist Fatigue Cracking

  • Resist Cold-Weather Cracking


Asphalt grades
Asphalt Grades

  • High Temperature for Rut Resistance

  • Low Temperature for Fatigue and Cold Weather Performance

    Performance Graded = PG

    PG 64-22 (PG Sixty-four Minus Twenty-two)

    High Temp 64°C (147°F)

    Low Temp –22°C (-8°F)





Asphalt modifications require pg 64 22
Asphalt Modifications Require PG 64-22

  • Stiffer at High Temperature – OK

  • Stiffer at Low Temperature

    • Use Lower Percentage of Shingles

    • Use Softer Roadway Asphalt


Deleterious evaluation
Deleterious Evaluation

  • Specification for Aggregate

    • 0.5% “Other Foreign Material”

      • Sticks, mud balls, deer fur, etc.

  • Shingle “OFM”

    • Approximately 3% Total


Deleterious material

Nails

Wood

Plastic

Cellophane

Paper

Fiber Board

Deleterious Material



No difference
No Difference

  • Visually

  • Standard Mixture Tests

  • Placement


Big difference
Big Difference

  • Rut Resistance

  • Cold Temperature Tests

  • OFM in Mixture


Trial project us 61 67 st louis co
Trial ProjectUS 61/67, St. Louis Co.

  • Part of Study with Minnesota

  • 4 Mixtures 19.0 mm Superpave

    • PG 58-28

      • 20% RAP

      • 15% RAP, 5% Shingles

    • PG 64-22

      • 20% RAP

      • 15% RAP, 5% Shingles


Study results
Study Results

  • IDT Testing by U of Mn

    • Tensile Strength Little Difference

    • Creep Stiffness Greatly Affected at Lower Temperatures

  • Evaluation of Reflective Cracking in Sections to Be Made



Can tear off shingles be used
Can Tear-Off Shingles be Used?

  • Allowance in OFM Due to Small Percentage of Shingles and Trial Mixture

  • Start with Softer Roadway Asphalt


Where are we the ex factor 2
Where Are We?The “Ex” Factor 2

  • Extrinsic Material Allowance Raised

    • 3.0% Total

    • 1.5% Wood

  • Expect PG 64-22 met w/ PG 58-28

    • Extra grades optional w/ testing

    • Examining various proportions and asphalts

  • Exuberant Contractors


Cardboard

Milk Jugs, Aluminum

Cans

Plastic Bottles

Newspaper

Newspaper


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