Premium
Moisture Movement and Readsorption Phenomena in Dried Clay Articles
Author(s) -
HOPE I. C.,
GABRIEL J.,
McDOWALL I. C.
Publication year - 1960
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1960.tb13615.x
Subject(s) - moisture , diffusion , ultimate tensile strength , water vapor , materials science , water content , composite material , ceramic , cracking , mineralogy , chemistry , geotechnical engineering , thermodynamics , geology , physics , organic chemistry
Readsorption of moisture occurs when dried ceramic articles are exposed to an atmosphere bearing water vapor with a partial pressure greater than that of the moisture remaining in the specimens. This readsorption is accompanied by a variable amount of expansion. It is suggested that stresses arising from differential expansion between the moist outside and the drier core are the cause of readsorption cracking or permanent loss of strength. Evidence is presented that diffusion of water vapor through a clay mass does not follow Fick's law, and the effect of this behavior on moisture and stress gradients within the piece is discussed. Calculations of the surface area from readsorption data yield values similar to those obtained by conventional methods despite simplified calculations based on Fick's law. A method of determining the tensile strength which is believed not to have been previously used for clay testing is described.