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Hydration products of calcium aluminoferrite

✍ Scribed by J.M. Fortune; J.M.D. Coey

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 355 KB
Volume: 13
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(83)90060-1

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✦ Synopsis

Hydration products of Ca2AIFe05, steam cured at 72 C, have been identified using X-ray diffraction and Mbssbauer spectroscopy.

Ironbearing phases are hydrogarnet Ca3Fe.AI 2 .(OH)f2 with y = 0.22, and non-crystalllne ferrlhydrlte Fe(OH)3~nH20~ These two are readily distinguished in ~dssbauer spectra at 4.2 K where they give, respectively, a single unspllt absorbtlon llne and a magnetically split hyperflne pattern with Hhf = 501 kOe. Addition of 5 wt% lime to the calcium alumlnoferrlte increases the proportion of iron In the hydrogarnet to y = 0.32 while leaving the ferrlhydrlte unchanged, whereas 5 wt% gypsum eliminates iron from the hydrogarnet entirely'and produces an even more disordered non-crystalline ferric hydrate.

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