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Title:

CHARACTERIZATION AND TECHNIQUES FOR RAPID EVALUATION OF IOWA FLY ASHES

Accession Number:

00387546

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309036607

Abstract:

An evaluation of seven fly ashes produced from Wyoming coal and available to the construction industry in Iowa is presented. X-ray spectrometry and diffraction were used to determine quantitative elemental and crystalline composition of the seven fly ashes, and long-term, multiple samples were taken at three sources to define variability in elemental composition. It was found that existing ASTM fly ash classification is not necessarily consistent with the coal type, that elemental variability within a single source can be equivalent of that of Type I portland cement, and that quantitative crystalline composition provides information useful for rational categorization. Of the seven fly ashes evaluated, three contained significant amounts of cementitious aluminum bearing phases; and all the fly ashes were comprised of about 25 percent crystalline compounds. Knowledge of cement led to development of a heat evolution test which may be useful in predicting cement content, and an evalaution of crystalline calcium and magnesium oxides suggests that soundness of fly ash-portland cement mortar is not influenced by magnesium oxide but is influenced by the crystalline calcium oxide present in the fly ashes evaluated.

Supplemental Notes:

Publication of this paper sponsored by Committee on Lime and Lime-Fly Ash Stabilization. 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 #:

01420440

Authors:

Pitt, J M
Mings, M L
Schlorholtz, S M

Editors:

Starkey, Jane

Pagination:

pp 12-17

Publication Date:

1983

Serial:

Transportation Research Record

Issue Number: 941
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

62nd Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1983-1-17 to 1983-1-21

ISBN:

0309036607

Media Type:

Print

Features:

Figures (5) ; References (8) ; Tables (6)

Subject Areas:

Geotechnology; Highways; Materials; I42: Soil Mechanics

Files:

TRIS, TRB

Created Date:

Sep 28 1984 12:00AM

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