01150977

Component

This paper describes a field study of the effect of tack on bond strength between a new asphalt concrete overlay and a milled surface. The study was a supporting activity to a program of research designed to identify a test method and acceptance criteria for bonding of asphalt concrete layers. The findings of the study led to the recommendation that the Virginia Department of Transportation no longer require the practice of tacking primary horizontal surfaces when placing a new overlay on a milled surface. An analysis of the costs associated with conventional tack use found that the material cost per lane-mile is between $572 and $836. A review of the typical “mill and fill” paving activity (maintenance) for the 2008 season found that the Virginia Department of Transportation (VDOT) would save between $488,000 and $650,000 per year by foregoing conventional tacking on milled horizontal surfaces. If the tacking material is of the non-tracking variety, which is becoming more and more common, the savings could be as much as $950,000 per year.

01147878

10-1050

English

15p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures; Photos; References (9) ; Tables (2)

Asphalt concrete; Bituminous materials; Milling; Pavement layers; Pavement maintenance; Paving; Tack coats; Texture

Virginia

Finance; Highways; Maintenance and Preservation; I60: Maintenance

Transportation Research Board Annual Meeting 2010 Paper #10-1050

PRP, TRIS, TRB

Jan 25 2010 10:28AM