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Title:

INFLUENCE OF AGGREGATE CHEMISTRY ON THE ADSORPTION AND DESORPTION OF ASPHALT

Accession Number:

00625703

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309054028

Abstract:

Asphalt-aggregate interactions were investigated by evaluating the adsorption and desorption of aged and unaged asphalts on four aggregates: limestone, greywacke, gravel, and basalt. The aggregate composition and surface chemistry had a greater effect on the adsorption and desorption characteristics of the asphalt-aggregate pair than the properties of the asphalt did. Adsorption and desorption isotherms were fitted to the Langmiur model and yielded predicted monolayer amounts, equilibrium constants for adsorption, and Gibbs free energy of adsorption. The Gibbs free energies were evaluated in terms of the principles of soil mechanics, which showed that water in the voids can be drawn to the asphalt-aggregate interface at relative humidities of 99% or above. Estimates of minimum tensile strength ratios were determined from Gibbs free energies and the extrapolated measured enthalpy values. The presence of water at the interface reduces the Gibbs free energy values between the asphalt and aggregate, thereby reducing the tensile strength and resistance to debonding fracture.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1362, Aggregate and Pavement-Related Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

01405044

Language:

English

Authors:

Curtis, C W
Lytton, R L
Brannan, C J

Pagination:

p. 1-9

Publication Date:

1992

Serial:

Transportation Research Record

Issue Number: 1362
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309054028

Features:

References (11) ; Tables (10)

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials; I36: Aggregates

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 1993 12:00AM

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