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Title:

CLAY MINERAL WEATHERING CONTROLS ON LIME AND CEMENT STABILIZATION OF SOUTHWESTERN ONTARIO CLAY BORROW. ABRIDGMENT

Accession Number:

00300398

Record Type:

Component

Availability:

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

Abstract:

This paper describes research concerning the significant role of clay mineral weathering in the upper 3 m of a clay crust in the compaction and stabilization characteristics of borrow materials extracted from different levels of the crust. The main mineralogical control is an increase in smectite (swelling clay) content toward the surface that is caused by oxidation weathering of unstable chlorites in the original soil. The results of the research indicate that the maximum dry density increases from about 1700 kg/cu m at .3-m depth to about 1950 kg/cu m at depth. The optimum moisture contents correspondingly decrease from about 19 or 20 at .3-m depth to 14 or 15 percent at depth. From the research results, the following conclusions can be drawn: oxidation weathering has altered inactive soil chlorites to active soil smectite in the near-surface soils of southwestern Ontario and has increased their activity from .4 to greater than 1; the surface soils compact to a maximum dry density of up to 300 kg/cu m less than the deeper soils that contain only 2 or 3 percent smectite; the surface soils are more difficulty to stabilize with hydrated lime and cement than the deeper soils because of their smectite content; cement is a more efficient stabilizer than lime for the whole soil and gives unconfined compression strengths two to three times those of lime at the 5 percent stabilizer level; and the soil fines (less than 2u m) are just as effectively stabilized by 4 percent lime as by 4 percent cement and yield nearly identical unconfined compression strengths.

Supplemental Notes:

Publication of this paper sponsored by Committee on Lime and Lime-Fly Ash Stabilization and Committee on Soil-Portland Cement 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 Title:

Stabilization and compaction

Monograph Accession #:

01411527

Authors:

Quigley, R M
Di Nardo, L R

Pagination:

pp 5-8

Publication Date:

1978

Serial:

Transportation Research Record

Issue Number: 690
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

57th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1978-1-16 to 1978-1-20

ISBN:

0309028361

Media Type:

Digital/other

Features:

Figures (2) ; References (14)

Geographic Terms:

Ontario, Canada

Old TRIS Terms:

Ontario, Canada

Subject Areas:

Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Sep 29 1979 12:00AM

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