Worldwide state of practice on the use of tack coats: A survey

Document Type

Conference Proceeding

Publication Date

12-1-2008

Abstract

This paper presents the results of a comprehensive survey on the worldwide state of practice on the use of tack coats for: new Hot Mix Asphalt (HMA) layers; HMA overlays on new, existing, and milled HMA; and for PCC pavements. The survey is a part of the National Cooperative Highway Research Program (NCHRP) 9-40 project titled Optimization of Tack Coat for HMA Placement. Surveys were sent to state departments of transportation, FHWA, Asphalt Institute field engineers, contractors, and selected highway agencies in other countries. The survey questions were developed to collect information on the state of the practice related to: types of materials used for tack coats; dilution rates of tack coat materials; residual application rates; determination of rate for different types of surfaces; methods used for tack coat distribution; and pavement failures related to tack coat application. The survey results were collected and analyzed. The key findings of the survey are summarized. The findings indicate that the application of tack coat can improve the bonding between pavement layers; asphalt emulsion is the most widely used tack coat material over asphalt cement and cutback asphalt, and the most commonly used emulsions are slow-setting emulsions; and there are no standard specifications available to determine the quality of tack coat materials. The remaining findings are documented in the results of this paper.

Publication Source (Journal or Book title)

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

First Page

1

Last Page

34

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