From dry pressing to plastic forming of ceramics: Assessing the workability window
authors Schiavo, LSA; Mantas, PQ; Segadaes, AM; Cruz, RCD
nationality International
author keywords Clay-based ceramics; Workability; Granular solids; Moisture states
keywords CLAYS
abstract The shaping water content in clay-based ceramic building materials has conflicting implications in shaping and drying, decisively contributing to the cost-effectiveness of the industrial process. This work addresses the long-standing difficulties related to the quantification of the workability window for plastic forming. From uniaxial compression stress-strain curves, the yield stresses of mixtures of a red-firing clay and a ground basalt rock with different moisture contents were obtained. Combination of those results with the wet and dried bodies densities, showed that ceramic powders can be shaped only while in the funicular state: for this clay, dry pressing is effective above the pendular-to-funicular transition (similar to 5.7 wt% moisture) and the workability window for plastic forming begins at the maximum dried body density, which signals the transition from open-to-closed gas pores in the funicular state (similar to 15 wt% moisture), and extends to the funicular-to-capillary transition (similar to 18 wt% moisture). Drying did not alter the moist particle structure, which enables the expeditious determination of the workability window from dried body density and initial moisture content. (C) 2018 Elsevier Ltd. All rights reserved.
issn 0950-0618
year published 2018
volume 189
beginning page 594
ending page 600
digital object identifier (doi) 10.1016/j.conbuildmat.2018.09.015
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000449133200056
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journal impact factor 4.419
5 year journal impact factor 5.036
category normalized journal impact factor percentile 83.285
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