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Title:

INFLUENCE OF VOID CHANGE, CRACKING, AND BITUMEN AGING ON DIFFUSIONAL LEACHING BEHAVIOR OF PAVEMENT MONOLITHS CONSTRUCTED WITH MSW COMBUSTION BOTTOM ASH

Accession Number:

00713586

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

The evaluation of leaching behavior of monolithic forms containing waste materials requires the use of leaching tests that evaluate diffusional release mechanisms. This can be coupled to procedures that accelerate the aging of the monolith to better predict long-term leaching behavior. As part of a comprehensive demonstration project examining the use of municipal solid waste combustion bottom ash as an aggregate substitute in bituminous binder course, the diffusional leaching behavior of ash constituents was assessed as a function of pavement voids level (5, 7.5, 10%), bitumen aging (none, medium, high), and monolith cracking (none, medium, high). Effective diffusion coefficients were determined for some ash constituents that leach; values ranged from "10 to the -12 power" to "10 to the -16 power" sq m/sec. These values are typical for ion diffusion in polymer systems. Species with small ionic radii (e.g., Na, Cl) were more diffusive than those with large ionic radii (e.g., Si, Zn). Monolith tortuosity values were found to be influenced only by monolith cracking. Diffusing specie chemical retention values and effective diffusion coefficients were not influenced by voids, cracking, or aging. Bituminous pavement monoliths release ash constituents at very low fluxes. Modeled releases of chloride for 10% wetting ranged from 1.7 g Cl/sq m/1.5 years to 54.9 g Cl/sq m/100 years. These fluxes are considerably smaller than fluxes associated with road salting during a single snowfall. The tortuous, hydrophobic nature of the monolith system controls diffusion.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1486, Environmental Testing and Evaluation of Stabilized Wastes, Performance of Stabilized Materials, and New Aggregate Tests. 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 #:

01399784

Language:

English

Authors:

Eighmy, T Taylor
Crimi, Douglas
Zhang, Shamim Hasan Xishun
Gress, David L

Pagination:

p. 42-48

Publication Date:

1995

Serial:

Transportation Research Record

Issue Number: 1486
Publisher: Transportation Research Board
ISSN: 0361-1981

Features:

Figures (8) ; References (19) ; Tables (2)

Uncontrolled Terms:

Tortuosity

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Materials; I35: Miscellaneous Materials

Files:

TRIS, TRB

Created Date:

Nov 22 1995 12:00AM

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