Pavement Layer Tacking and Bonding February 26, 2015

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Presentation transcript:

Pavement Layer Tacking and Bonding February 26, 2015 David T. Lee, P.E. District Materials Engineer

Bond

Issues with Bond

Core Separation (New Construction)

NCAT Test Track

Conclusions from NCAT

Tack

Road and Bridge Specifications, Sec. 310.03 Tack Road and Bridge Specifications, Sec. 310.03 Undiluted asphalt shall be applied at the rate of 0.05 to 0.10 gallons per square yard. Diluted asphalt shall be applied at the rate of 0.10 to 0.15 gallons per square yard.

Tack Application Rate

Tack Application Rate

Tack Application Rate

Tack Application Rate

Tack Application Rate

Tack Application Rate

Tack Application Rate

Tracking of Tack

Tack and Bond Strength Issues to be Addressed Specification of correct tack material Storage and handling of tack Measurement and verification of application rates Verification of bond strength ? Tracking of tack

Virginia Tack and Bond Task Force The first meeting of the Virginia Tack & Bond Strength Task Force was held on Friday, February 6, 2015. Task Force Lead: Rob Crandol Initial Topics: Defining the scope, schedule and expectations of the task force Information about best practices & specs currently used around the country Establishing and agreeing on clear ‘problem statements’ Planning future work