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Title:

CHARACTERISTICS OF LIME RETENTION BY MONTMORILLONITIC CLAYS

Accession Number:

00230499

Record Type:

Component

Abstract:

PREVIOUS WORK HAS SHOWN THAT HYDRATED LIME ADDED TO CLAYEY SOILS REDUCES THEIR PLASTICITY. ABOVE A CERTAIN PERCENT LIME THERE IS A LEVELING OFF AND NO FURTHER REDUCTION. THE POINT AT WHICH THIS LEVELING OFF BEGINS MAY BE REFERRED TO AS THE LIME RETENTION OR LIME FIXATION POINT. THE AMOUNT OF LIME NEEDED TO SATISFY THE LIME RETENTION REQUIREMENT OF CLAYS MUST BE EXCEEDED IF LATER POZZOLANIC CEMENTITIOUS REACTIONS ARE TO PROCEED. LIME RETENTION OCCURS IN CLAYS ALREADY CALCIUM SATURATED, ALTHOUGH SODIUM CLAYS TAKE MORE LIME. THE TOTAL CALCIUM RETAINED EXCEEDS THE CATION EXCHANGE CAPACITY AS MEASURED BY THE AMMONIUM ACETATE METHOD. LIME RETENTION BY CLAYS WERE STUDIED BY MEASUREMENTS OF PLASTIC LIMIT, PH, VISCOSITY, EXCHANGEABLE CALCIUM, AND X-RAY DIFFRACTION. THE LIME RETENTION POINT WAS MOST PRONOUNCED IN MONTMORILLONITIC CLAYS, AND COINCIDES WITH A GRADUAL INCREASE IN PH AND A SHARP RISE IN VISCOSITY OF SUSPENSIONS AS MEASURED BY A STORMER PADDLE- ROTATION TYPE OF VISCOSIMETER. THE RISE IN VISCOSITY WAS OBSERVED WITH NATURAL SODIUM- AND CALCIUM-SATURATED BENTONITES AND WITH IOWA GUMBOTIL AND PLASTIC LOESS SOILS. VISCOSITY DEPENDS ON PH AS WELL AS ON CALCIUM ION CONCENTRATION, AND REACHES A MAXIMUM AT AROUND PH 11.8. HYPOTHESES OF LIME RETENTION ARE PRESENTED. /AUTHOR/

Supplemental Notes:

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 #:

01410000

Language:

English

Authors:

Ho, Clara
Handy, R L

Pagination:

pp 55-69

Publication Date:

1963

Serial:

Highway Research Record

Issue Number: 29
Publisher: Highway Research Board

Media Type:

Print

Features:

Appendices (3) ; Figures (16) ; References (12) ; Tables (2)

Uncontrolled Terms:

Hypothesis; X-ray diffraction

Old TRIS Terms:

Subject Areas:

Data and Information Technology; Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Aug 15 2004 2:40AM

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