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Firing transformations of a carbonatic clay from the High-Atlas, Morocco

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Abstract:

The firing transformations of a Triassic calcareous clay were investigated, in the range 800-1075ÂșC, by using X-ray diffraction and by measuring some ceramic properties (linear shrinkage, density and porosity). It was found that gehlenite and wollastonite are the only neoformed crystalline phases, when anorthite is also expected. The occurrence of these phases is discussed, emphasizing the role of the activity of free silica and calcite concentration. Moreover, new reaction paths for anorthite and wollastonite are envisaged.

Keywords: CARBONATIC CLAY; EYWORDS; K FIRING TRANSFORMATION; MOROCCO; TRIASSIC; XRD.

Document Type: Research Article

DOI: https://doi.org/10.1180/0009855033830102

Publication date: 2003-09-01

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