00634582

Component

http://onlinepubs.trb.org...trr/1993/1386/1386-005.pdf

https://scholar.google.co...rtis&publication_year=1993

The effects of aggregate chemistry and modification of that chemistry by organosilane coupling agents were examined by using a variety of adsorption and desorption methods. The combination of adsorption and desorption as in the net adsorption test offers a means of predicting adhesion propensity and water resistance of aggregates. Changing the aggregate surface by bonding a chemical species to it, such as a hydrocarbon or amino group, can radically change the adsorptive behavior of aggregates. The aggregate surfaces of two asphalt model compounds, benzoic acid and phenanthridine, and an asphalt were modified with organosilane coupling agents, and the effect on their adsorption and desorption behavior was investigated. Organosilane coupling agents--hydrocarbon silane of C8 chain length, thiol silane, and amino silane--were used to modify the surface of aggregates composed of limestone and gravel. The adsorption and desorption behavior of selected asphalt model compounds and AAD-1 asphalt was determined on the modified aggregates and compared with that obtained on natural aggregates. This comparison has been reported as the percent change in the water sensitivity between asphalt and aggregate. Each asphalt model compound or asphalt-aggregate combination was observed to present highly specific behavior that was dependent on the chemistry of the compound or asphalt as well as on the chemistry of the silane coupling agent.

This paper appears in Transportation Research Record No. 1386, Conference on SHRP Asphalt Research: Papers presented at the Conference, January 10, 1993, Washington, D.C. 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

01403223

English

p. 38-48

1993

Transportation Research Record

0309054559

Figures (1) ; References (10) ; Tables (5)

Adsorption; Aggregates; Asphalt mixtures; Chemistry; Desorption; Gravel; Limestone aggregates

Strategic Highway Research Program

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

TRIS, TRB, ATRI

Aug 31 1993 12:00AM

• EVALUATION OF ASPHALT-AGGREGATE MIXTURE AGING BY DYNAMIC MECHANICAL ANALYSIS
• ROLE OF ASPHALT AND AGGREGATE IN THE AGING OF BITUMINOUS MIXTURES
• THE ROLE OF PESSIMUM VOIDS CONCEPT IN UNDERSTANDING MOISTURE DAMAGE TO ASPHALT CONCRETE MIXTURES
• THERMODYNAMIC BEHAVIOR AND PHYSICOCHEMICAL ANALYSIS OF EIGHT SHRP BITUMENS