Abstract
AbstractIt has been shown that the reaction between aluminium powder and the aqueous phase of cement pastes is chiefly characterised by a definite inhibition period when no hydrogen evolves, followed by a slow evolution of gas. The utility of aluminium powder in reducing the early shrinkage of cement pastes depends upon this gradual reaction. The inhibition is specifically associated with the presence of ettringite on the surface of aluminium particles. It is suggested that the ettringite is formed by reaction of calcium sulphate with the hydrous oxide film on aluminium particles: termination of a period where no hydrogen is evolved, probably results from a more or less complete conversion of aluminium oxide to ettringite.
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