Alkali reactivity of dolomitic limestone aggregate

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Journal titleMagazine of Concrete Research
Pages95104; # of pages: 10
Subjectbases (chemistry); concrete admixtures; limestone; dolomite; expansion
AbstractAdditional evidence was obtained in support of the hypothesis that excessive expansion in the alkali-carbonate rock reaction is caused by moisture uptake by the previously `unwetted clay' constituent. The dedolomitization reaction is shown to be necessary only to provide access of moisture to the `locked-in' clay. A microscopic method was used to determine the specific surface of the dolomite, the quantitative nature of which made it possible to define a practical upper limit below which expansion does not occur. It was also shown that relatively small percentages of illitic clay can account for the excessive expansion shown by reactive carbonate rocks. The new techniques used included measurements of dimensional change of thin rock wafers and of compacts of clay and powdered rock.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number9552
NPARC number20374702
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Record identifierb001bae4-cf75-4fd0-b8db-307230d247c3
Record created2012-07-23
Record modified2016-05-09
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