The National Academies

NCHRP Synthesis 20-05/Topic 48-02 [Final (Synthesis)]

Tack Coat Specifications, Materials, and Construction Practices
[ NCHRP 20-05 (Synthesis of Information Related to Highway Practices) ]

  Project Data
Funds: $45,000
Authorization to Begin Work: 5/9/2016 -- estimated
Staff Responsibility: Mariela Garcia-Colberg
Research Agency: Asphalt Institute
Principal Investigator: Danny Gierhart
Effective Date: 9/9/2016
Completion Date: 5/14/2018
Fiscal Year: 2016

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 516: Tack Coat Specifications, Materials, and Construction Practices provides state agencies across the United States with guidance as they reevaluate their tack coat specifications, the materials they use, and the practices by which the tack coats are placed. Pavement thickness design assumes that pavement works together as one layer, rather than a stack of individual layers working independently. Tack coats function as bonding agents between each lift of a pavement section to create the desired monolithic pavement structure. A tack coat is a sprayed application of asphalt material upon an existing asphalt or Portland cement concrete (PCC) pavement prior to an overlay, or between layers of new asphalt concrete. 

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