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Title:

ADSORPTION OF MODEL ASPHALT FUNCTIONALITIES, AC-20, AND OXIDIZED ASPHALTS ON AGGREGATE SURFACES

Accession Number:

00495095

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309048230

Abstract:

This investigation examined the competitive adsorption behavior of asphalt functionalities for silica and the adsorption behavior of AC-20 and asphalts oxidized to different degrees on real and actual aggregates. The competitive affinity for dry silica of paired combinations of seven model functionalities known to be present in asphalt was determined. The affinity shown by the components in a competitive situation was different from that of the individual components. Competitive adsorption was also performed on moistened silica. The nitrogen base, quinoline, was most sensitive to moisture, whereas the sulfoxide was the least sensitive. In addition, asphalt oxidized to different degrees was adsorbed onto silica, alumina, sandstone, and limestone. On moist and dry silica and alumina, AC-20 was adsorbed more than the oxidized asphalts. On limestone and sandstone, the adsorption of AC-20, oxidized asphalt, and their respective asphaltene fractions was concentration dependent. Most of the adsorption behavior fitted the Langmuir model better than the Freundlich model. Monolayer amounts obtained from the Langmuir isotherms decreased with increased oxidation levels. The nature of the adsorbed asphaltic carbon was examined by controlled atmosphere electron microscopy.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1228, Asphalt Mixtures and Asphalt Chemistry. 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 #:

01407207

Authors:

Curtis, Christine W
Clapp, Douglas J
Jeon, Young W
Kiggundu, Badru M

Pagination:

p. 112-127

Publication Date:

1989

Serial:

Transportation Research Record

Issue Number: 1228
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309048230

Features:

Figures (7) ; Photos (2) ; References (18) ; Tables (6)

Subject Areas:

Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Jun 30 1990 12:00AM

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