Mechanism of the alkali-carbonate rock reaction

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Journal titleJournal of Engineering Geology
Pages723; # of pages: 17
Subjectexpansion; carbonaceous rocks; dolomite; bases ( chemistry); portland cement; roche carbonifere; dolomite; base ( chimie); ciment portland
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.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number11338
NPARC number20374619
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Record identifier5d97f7e0-3fee-4fb6-bc4e-4964b33020d3
Record created2012-07-23
Record modified2016-05-09
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