A Mössbauer study on the hydration of brownmillerite (4CaO.A12O3.Fe2O3)

Ferenc D. Tamás, Attila Vértes

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The hydration of the iron-bearing phase of portland cement or brownmillerite, can be easily studied by Mössbauer-spectrometry, because a very significant difference exists between the spectra of anhydrous and hydrated brownmillerite. The Mössbauer spectrum of anhydrous brownmillerite shows a magnetic hyperfine structure and iron is present in a complex environment. During hydration the magnetic hyperfine structure disappears and only one sharp line remains showing that all iron atoms are surrounded by the same, very symmetric environment. The hydration is almost complete after 14 days. The hydration product is a solid solution of tricalcium aluminate hexahydrate and tricalcium ferrite hexahydrate (hydrogarnet). The full quantity of iron is bound in this hydrate and is present in an octahedral environment. Excess aluminum is present in the form of amorphous hydroxide.

Original languageEnglish
Pages (from-to)575-581
Number of pages7
JournalCement and Concrete Research
Issue number5
Publication statusPublished - Sep 1973


ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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