Journal Published Online: 01 June 1997
Volume 19, Issue 1

Expandability of Solid-Volume-Reducing Reactions of Alkali-Magnesite and Alkali-Dolomite



The work presented in this paper concerns two solid-volume-reducing reactions between alkali-dolomite (ADR) and alkalimagnesite (AMR). It was found that the two reactions can cause considerable expansion of compacts made from dolomite or magnesite powder and 20% Portland cement when cured at 150 and 60°C in 10% KOH solution. The results confirmed an earlier suggestion that the formation and growth of crystalline products in a confined space may be expandable.

The expandability of the alkali-magnesite reaction was first recognized by the authors using newly developed test methods—150°C autoclaving of concrete microbars and miniature rock prism tests. Although magnesite itself is rarely used as a concrete aggregate, it is reasonable to investigate the reaction since concrete aggregates may contain a certain amount of magnesite.

Author Information

Tong, L
Tsinghua University, People's Republic of China
Tang, M
Nanjing University of Chemical Technology, Nanjing, People's Republic of China
Pages: 7
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Stock #: CCA10019J
ISSN: 0149-6123
DOI: 10.1520/CCA10019J