The use of mineralogical indicators for the assessment of firing temperature in fired-clay bodies

0491220 - ÚTAM 2019 RIV NL eng J - Journal Article
Viani, Alberto - Cultrone, G. - Sotiriadis, Konstantinos - Ševčík, Radek - Šašek, Petr
The use of mineralogical indicators for the assessment of firing temperature in fired-clay bodies.
Applied Clay Science. Roč. 163, October (2018), s. 108-118. ISSN 0169-1317. E-ISSN 1872-9053
R&D Projects: GA MŠMT(CZ) LO1219
Keywords : fired-clay bricks * X-ray diffraction analysis * Rietveld method * firing temperature * amorphous fraction
OECD category: Ceramics
Impact factor: 3.890, year: 2018
https://doi.org/10.1016/j.clay.2018.07.020

Fired-clay bricks are frequently object of conservative actions aimed at the preservation of cultural heritage. Information on firing conditions is relevant for the production of custom made replacement bricks, since, as a widely accepted principle, they should be close match to the pre-existing ones. In this work, the mineralogical and microstructural evolution of fired-clay bodies is described using a combination of analytical techniques, and an approach for the assessment of firing temperature using calibration curves built from the results of X-ray powder diffraction quantitative phase analysis with the Rietveld method, is presented. The weight fractions of hematite, mullite and the amorphous fraction, from two raw clays fired in the laboratory at different temperatures, have been used to assess the firing temperature of two industrially produced bricks. The values derived applying these three methods were in good agreement with the nominal temperatures of the industrial cycles. This approach might be of interest for the assessment of the firing conditions of a broader range of historical/archaeological fired-clay materials.
Permanent Link: http://hdl.handle.net/11104/0285261