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Title:

MODELING OF OXIDATIVE AGING BEHAVIOR OF ASPHALTS FROM SHORT-TERM, HIGH-TEMPERATURE DATA AS A STEP TOWARD PREDICTION OF PAVEMENT AGING

Accession Number:

00730237

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309059100

Abstract:

The oxidative aging data collected during the Strategic Highway Research Program have been analyzed in terms of kinetics of viscosity change with time and temperature. Changes in viscosity have been used as the measure of the progress of aging. The objective is to model viscosity increases accurately enough to be able to predict aging (in terms of viscosity changes) at pavement temperatures from short-term test data acquired at high temperature. This involved constituting a mathematical model, based on oxidative reactions, and a nonlinear regression of the data to test predictability of the proposed model. Clearly, there is a point beyond which viscosity change becomes independent of time, but no data were collected to that extent. Separately, it has been shown that oxidation of aliphatic sulfide to sulfoxide and oxidation of benzylic carbon to carbonyl are the principal chemical reactions that contribute to an increase in viscosity. The data fit the proposed equation sufficiently well to allow calculation of rate constants of viscosity increases for both reactions, and, hence, allow development of an Arrhenius temperature relationship. Finally, it is hoped that the proposed equation will provide reasonable estimates of rates of oxidative aging of asphalts at pavement temperatures from short-term, high-temperature oxidative aging data measured in a laboratory.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1535, Characteristics of Asphalt Binders.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Huh, J-D
Robertson, R E

Pagination:

p. 91-97

Publication Date:

1996

Serial:

Transportation Research Record

Issue Number: 1535
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309059100

Features:

Figures (9) ; References (16) ; Tables (2)

Uncontrolled Terms:

Short term

Old TRIS Terms:

Subject Areas:

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

Files:

TRIS, TRB

Created Date:

Dec 13 1997 12:00AM

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