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Title:

USE OF HYDRATED FLY ASH AS A FLEXIBLE BASE MATERIAL

Accession Number:

00731128

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309059518

Abstract:

Common uses for fly ash, such as soil stabilization and cement replacement, account for less than 20% of the fly ash produced in the United States. Therefore, finding other bulk uses for fly ash is important. One such potential application is hydrated fly ash as a base material. The Texas Department of Transportation (TxDOT) is working to produce specifications to incorporate hydrated fly ash as a flexible base material. High-calcium Class C fly ash has a self-hydrating capability in the presence of moisture. Class C fly ash produced from coal power plants using lignite and subbituminous coal is mixed with water, dumped in large pits, and left to hydrate for a period of 3 to 6 weeks. The result is a hard, homogeneous mass of hydrated fly ash that can be mined to produce a construction aggregate much like limestone. TxDOT has used this material on several test projects. It has a desirable compressive strength, but in some instances its adhesion to seal coats has been a problem. Laboratory studies indicate that hydration water content has a significant influence on its strength. Microscopic investigations on hydrated Class C fly ash indicate that the hydration products may depend on the curing conditions. Hydrated Class C fly ash has a potential as a flexible base material provided that the curing process is carefully managed.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1546, Issues in Geotechnical Engineering Research.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Senadheera, S P
Jayawickrama, P W
Rana, ASMA

Pagination:

p. 53-61

Publication Date:

1996

Serial:

Transportation Research Record

Issue Number: 1546
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309059518

Features:

Figures (2) ; Photos (12) ; References (4) ; Tables (5)

Geographic Terms:

Texas

Old TRIS Terms:

Texas

Subject Areas:

Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers

Files:

TRIS, TRB

Created Date:

Feb 3 1997 12:00AM

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