Tack Coat Specifications, Materials, and Construction Practices (2018)

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Conclusions 81 Reduced-tracking materials often have more stringent storage and handling requirements to keep them stable before usage. While fully functional using manufacturer-recommended guidelines, longer available storage times with reduced agitation requirements would make the materials more user-friendly and decrease the possibility of emulsion separation issues. Although reduced-tracking materials have been successfully used in colder climates, there is some research and anecdotal evidence to suggest that emulsions with a hard penetration base may become brittle at cold temperatures, increasing the risk of bond failure. Future research in this area could either resolve existing questions in this area or find ways to maintain flexibility at lower temperatures. Through several recent publications and live training events, best practices of tack coat appli- cation in the field are better understood in the industry at large than ever. According to the survey results from this synthesis, 70% to 80% of U.S. and Canadian agencies have some method by which they check the tack coat application rate in the field. However, more training may be needed to push those percentages closer to 100. As it is often said, “that which gets measured, gets done.” Perhaps the biggest remaining question is how following best practices for specifications, materials, construction practices, and quality assurance actually affect the tack coat’s long-term performance. Very little research has been done to date in this area. It is a step in the right direc- tion to better understand how materials and their application perform at the beginning of their service life. It would be very valuable to have a better understanding of how a quality tack coat performs throughout its service life, and subsequently how tack coats affect asphalt pavements throughout their service life. It is hoped that information provided in this synthesis will aide state agencies as they review their current practices regarding tack coats and assess what changes to their current specifi- cations should be implemented. The synthesis should help agencies identify gaps in (1) their current specifications, (2) their practices, and (3) research needed to provide them with the information they need to best ensure a sufficient bond between their asphalt pavement lifts.

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