Abstract
Compacted cylinders made of reactive minerals (dolomite and magnesite) and Portland cement in the ratio of 4:1 were prepared to observe the expandability of the two solid-volume-reducing reactions—alkali-dolomite and alkali-magnesite reaction. After measuring the reaction degrees determined by quantitative XRD analysis, it was found that expansion correlated well with the degree of the reaction occurred in the compacts. This result provided a positive evidence towards the previously proposed expansion mechanism, which suggested that the expansion of alkali-carbonate reaction is due to the formation and growth of the reaction products in confined space.
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