Mechanism and kinetics of expansion in the alkali- carbonate rock reaction

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DOIResolve DOI: http://doi.org/10.1139/e64-007
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TypeArticle
Journal titleCanadian Journal of Earth Sciences
ISSN0008-4077
Volume1
Issue2
Pages121145; # of pages: 25
Subjectlimestone; fine grained soils; expansion; alkalinity; water absorption
AbstractThis paper reviews the main hypotheses proposed for the alkali-carbonate rock reaction, and presents evidence supporting the mechanism advanced by this laboratory. The new evidence consists of (a) no volume change of pure dolomite crystals immersed in 2M NaOH for 4 months; (b) the decreasing expansion of solid plus liquid of rock powders in 2M NaOH with increasing particle size of pure dolomite, using a dilatometer technique; (c) the observation from scanning electron micrographs of alkali-reactive and non- reactive rocks that much of the clay constituent appears to be distributed close to the dolomite rhombs, thus accounting more readily for the idea that dedolomitization opens up channels for moisture to gain access to the clay; and (d) a detailed study of some 50 carbonate rocks from the highly calcitic to the highly dolomitic with special emphasis on petrographic examinations and their correlations with results of laboratory performance.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-222
NRC number8040
223
NPARC number20373905
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Record identifiereadc58e0-b274-4c14-b227-ae23eb2e5a89
Record created2012-07-23
Record modified2016-05-09
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