THE STABILITY OF THE CALCIUM SULFOALUMINA TE HYDRATES IN AQUEOUS SOLUTIONS

  • GHORAB H
  • KISHAR E
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Abstract

The stability of the calcium sulfoaluminate hydrates in pure water and in different concentrations of sodium hydroxide solutions has been studied at normal pressure and temperatures up to 100°. The amount of the dissolved sulfate and aluminium has been measured in solution and related to the behaviour of the solid phases. Under normal conditions the ettringite resists alkaline solutions of concentrations equal to or less than 0.2M. Its decomposition is accelerated by temperature and alkali. It forms as a result of the decomposition of the mono-sulfate hydrate in water at temperatures

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Authors

  • H.Y . GHORAB

  • E.A. KISHAR

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