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Title:

Characterization of Warm Mix Asphalt Additives Using Direct Contact Angle Measurements and Surface Free Energies

Accession Number:

01518450

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This paper evaluates three warm mix asphalt (WMA) additives in terms of surface energies and moisture damage performance. The WMA additives are increasingly being used in asphalt mixes due to the advantages they provide over the conventional hot mix asphalt (HMA), including reduced energy consumption, reduced emissions, good workability, and extended construction season in cold climates. In order to minimize the moisture damage potential and maximize the performance of the WMA pavements, the WMA additive, and its percentage and compatibility with the binder and aggregate in the asphalt mixture should be selected accordingly. The effects of the WMA additives on the moisture damage potential of asphalt mixes can be evaluated using the surface free energy (SFE) approach. In this paper, the WMA additives Sasobit, Evotherm, and Permatac Plus were evaluated. The SFE components of a neat PG 64-22 asphalt binder modified with different percentages of the WMA additives have been determined using a sessile drop (SD) device. The contact angles of the probe liquids on modified asphalt binder specimens were measured directly and the SFE components of these samples were calculated using the Good-van Oss-Chaudhury (GVOC) approach. The moisture damage potential of the mixes was then evaluated using an energy ratio approach. The initial assessment of the energy ratio approach indicates that this parameter might be employed for evaluating the compatibility of asphalt binders and aggregates. The study also shows that the SD device is a practical, robust, and economical equipment and can easily be adopted for pavement materials characterization.

Supplemental Notes:

This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures. Alternate title: Characterization of Warm-Mix Asphalt Additives Using Direct Contact Angle Measurements and Surface Free Energies.

Monograph Accession #:

01503729

Report/Paper Numbers:

14-4417

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Koc, Murat
Bulut, Rifat

Pagination:

15p

Publication Date:

2014

Conference:

Transportation Research Board 93rd Annual Meeting

Location: Washington DC
Date: 2014-1-12 to 2014-1-16
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Identifier Terms:

Evotherm; Permatac Plus; Sasobit

Subject Areas:

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Source Data:

Transportation Research Board Annual Meeting 2014 Paper #14-4417

Files:

TRIS, TRB, ATRI

Created Date:

Jan 27 2014 3:32PM