Transition of Friedel phase to chromate-AFm phase-Reference-Cited by-同舟云学术

Transition of Friedel phase to chromate-AFm phase

Published:2008-10 Issue:4 Volume:20 Page:167-173
ISSN:0951-7197
Container-title:Advances in Cement Research
language:en
Short-container-title:Advances in Cement Research

Author:

Zhou J.-Z.¹,Qian G.-R.¹,Cao Y.-L.¹,Chui P.-C.²,Xu Y.-F.¹,Liu Q.¹

Affiliation:

1. School of Environmental Engineering, Shanghai University 200072, P.R. China

2. School of Civil & Environmental Engineering, Nanyang Technological University 639798, Singapore

Abstract

The transition of the Friedel phase to the chromate-AFm phase in chromate solution and the thermal stability of the products was investigated using thermal analysis combined with mass spectrometry, X-ray diffraction and Fourier transform infrared spectrometer. The results indicated that [Formula: see text] easily substituted for Cl in the Friedel phase forming chromate-AFm. The chemical formula of chromate-AFm was characterised as 3CaO·Al2O3·CaCrO4·12H2O. Chromate-AFm gave two steps of dehydration, two steps of dehydroxylation and one step of redox reaction of Cr(VI) in the whole heating process from 40 to 1000°C. The Fourier transform infrared spectra showed different OH-metal binding ways for the Freidel phase and chromate-AFm.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/adcr.2008.20.4.167

Reference16 articles.

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2. Precipitates in a Cr(VI)-Contaminated Concrete

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5. Layered double hydroxides as potential chromate scavengers

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