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• Alabama
• Florida
• Georgia
• Illinois
• Louisiana
• Maryland
• Mississippi
• Pennsylvania
• New York
• North Carolina
• Ohio
• Oklahoma
• South Carolina
• Tennessee
• Virginia
• West Virginia
• Texas

17 17 St States Known to Allow Reduced Tr Tracking Tack Materials

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• Looked at numerous test

methods (shear, tension, torsion)

• Many tack materials
• Four application rates

(gsy residual)

• 0.00
• 0.031
• 0.062
• 0.155
• International survey
• Variety of surfaces both

AC and PCC

• New
• Old
• Milled
• Unmilled
• Dry
• Wet
• Clean
• Dirty
• Eight test temps.
• -10—60°C

NCHRP Report 712

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