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Title:

Microsurfacing: Is Asphalt Film Thickness a Chemistry or a Design Problem?

Accession Number:

01373723

Record Type:

Component

Abstract:

Micro-surfacing is a popular technique in pavement preservation and can be both effective and economical if correct design and construction techniques are implemented. With the complexity of micro-surfacing, asphalt film thickness (AFT), becomes an issue. Similar to hot mix asphalt and other bituminous mixtures, AFT is widely questioned and criticized. A mixture with an excessive AFT could result in a disastrously rich design, which could cause skid resistance, deformation and bleeding problems. A mixture with insufficient AFT could result in a disastrously lean design, which could cause raveling and durability issues. Prior research has shown micro-surfacing mixtures containing AFT of 5.5 to 8 microns to produce adequate designs. Research described in this paper presents laboratory test methods measuring effectiveness of optimum conditions of micro-surfacing to AFT. It is believed for a given AFT, a “medium”, exists with the optimum emulsion content used in the design of a micro-surfacing application. This paper utilizes four AFT equations to determine this “medium” that could be utilized in design. Results indicate that aggregates with a certain range of surface area, emulsion content, and mass loss produces acceptable AFT for optimum conditions used in design.

Supplemental Notes:

This paper was sponsored by TRB committee AFK20 Characteristics of Asphalt Materials

Monograph Accession #:

01362476

Report/Paper Numbers:

12-3304

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Jordan III, Walter Stephens
Baumgardner, Gaylon L
Hemsley Jr, James M

Pagination:

10p

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; References; Tables

Subject Areas:

Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-3304

Files:

TRIS, TRB

Created Date:

Feb 8 2012 5:15PM