|
authors |
Schiavo, LSA; Mantas, PQ; Segadaes, AM; Cruz, RCD |
|
nationality |
International |
|
journal |
CONSTRUCTION AND BUILDING MATERIALS |
|
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. |
|
publisher |
ELSEVIER SCI LTD |
|
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
|
