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Title:

Effect of Using Fog Seals Without Sanding on Surface Friction and Durability of Open-Graded Friction Course

Accession Number:

01372816

Record Type:

Component

Abstract:

The Alabama Department of Transportation has customarily used open-graded friction course (OGFC) as the final riding surface on interstate and high traffic roadways because of its safety benefits. However, some OGFC sections have experienced premature failures, threatening its use as a surface course. Mixtures on those projects are raveling out after only 6 to 8 years in service. To maintain the good performance of OGFC, preventive maintenance has been considered essential. There are several approaches for maintaining OGFC, one of which is the application of fog seals. While fog seals can reduce raveling and extend the service life of OGFC, there are two trade-offs that must be considered, including decrease in the drainability and temporary loss of surface friction. The objective of this study is to evaluate the effect of using fog seals without sanding on the surface friction and durability of OGFC. The study evaluated three fog seal materials through both field work and laboratory testing. The results of this study showed that the surface friction based on the IFI parameter F60 may be reduced between 2 to 24 percent. Therefore, fog seals without sanding should be used with extreme caution on OGFC as they may cause a temporary loss of friction. Each of the fog seal products evaluated in this study appeared to improve the abrasion resistance of OGFC based on the Cantabro test, and the Hamburg test results clearly showed a trend that the middle spray rate (0.10 gal/sy) was better in enhancing resistance to rutting/moisture susceptibility of OGFC.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements

Monograph Accession #:

01362476

Report/Paper Numbers:

12-4544

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Tran, Nam
Watson, Donald E
Anwer, Nadeem

Pagination:

18p

Publication Date:

2012

Conference:

Transportation Research Board 91st Annual Meeting

Location: Washington DC, United States
Date: 2012-1-22 to 2012-1-26
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Uncontrolled Terms:

Fog seals

Subject Areas:

Highways; Materials; Pavements; I30: Materials

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-4544

Files:

TRIS, TRB

Created Date:

Feb 8 2012 5:25PM