INVESTIGATION OF DIFFERENT CURING TEMPERATURES ON PHASE CHANGES DURING DRYING OF CASTABLES

Köhler A, Kuiper S, Klaus S, Götz-Neunhoeffer F (2022)

Publication Type: Conference contribution

Publication year: 2022

Publisher: UNITECR

Conference Proceedings Title: Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings

Event location: Chicago, IL US

Abstract

In this study, the influence of different curing temperatures on the subsequent phase changes during the drying process of calcium aluminate cement bond castables is presented. A mixture of CAC and alumina was hydrated at different temperatures (5, 23, 40°C), which should represent extreme working conditions during casting. The quantitative phase composition after 48 h of hydration was determined by Rietveld-analysis. Thermogravimetric analysis was also used to characterize the weight loss during heating. The results have shown that above 350 °C all hydrate phases are dehydrated, but that the differently cured samples lead to quite different dehydration processes and phase compositions. Therefore, the cured samples were heated up to 180 °C, as at this temperature the different curing conditions lead to a different dehydration progress. The different starting conditions before drying strongly affect the final phase composition, as well as a different way to get the water-free product. Samples cured at moderate or high temperature lose water over a wider temperature range. In contrast, in samples cured at low temperature, almost all unbound H2O and water in hydrate phases is removed at temperatures below 180 °C.

Authors with CRIS profile

Andreas Köhler Lehrstuhl für Mineralogie Friedlinde Götz-Neunhoeffer Lehrstuhl für Mineralogie

Involved external institutions

Almatis B.V. NL Netherlands (NL) Almatis GmbH DE Germany (DE)

How to cite

APA:

Köhler, A., Kuiper, S., Klaus, S., & Götz-Neunhoeffer, F. (2022). INVESTIGATION OF DIFFERENT CURING TEMPERATURES ON PHASE CHANGES DURING DRYING OF CASTABLES. In Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. Chicago, IL, US: UNITECR.

MLA:

Köhler, Andreas, et al. "INVESTIGATION OF DIFFERENT CURING TEMPERATURES ON PHASE CHANGES DURING DRYING OF CASTABLES." Proceedings of the 17th Unified International Technical Conference on Refractories, UNITECR 2022, Chicago, IL UNITECR, 2022.

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