Publication Date:
2019
Description:
Abstract
The drying behavior for various calcium aluminate cement‐ and hydratable alumina‐bonded refractory castables was investigated in the temperature range of first‐drying (100‐300 °C). Using a specialized high‐temperature Nuclear Magnetic Resonance setup, we were able to directly and non‐destructively measure the spatially and temporally resolved moisture distribution, while simultaneously measuring the temperature distribution as well. These measurements show that the drying front position is a linear function of time, which can be explained on the basis of a simplified model where only vapor transport is considered. Based on the measurements and the model one can directly determine the permeability at high temperatures. Moreover, the results demonstrate that the drying front speed and temperature strongly correlates with control of key material parameters (e.g. water demand, binder content, etc.). In particular, microsilica fume‐containing Low‐Cement Castables displayed the highest vapor pressures, while Regular Castables generated the lowest vapor pressures reflecting the permeability of these materials.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
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