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Hydration kinetics of calciumaluminate phases in the presence of various ratios of Ca2+ and SO42− ions in liquid phase

✍ Scribed by J. Havlica; D. Roztocká; S. Sahu

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
315 KB
Volume
23
Category
Article
ISSN
0008-8846

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✦ Synopsis

The kinetics of hydration processes of tricalcium aluminate and monocalcium aluminate in the presence of calcium sulphates and calcium hydroxide was studied at room temperature by differential calorimetry and X-ray diffraction analysis. Results indicate that the solubility of calcium sulphates (anhydrite, gypsum) and pH near the surface of calcium aluminates play an, important role during hydration process. The high ratio of 'basic" ions of Ca 2+ in the structure of aluminates lead to retardation of the transfer of ions into solution and enable formation of an ettringite layer on the surface.

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