Development of analytical model relating compressive strength in porous ceramics to mercury intrusion porosimetry-derived microstructural parameters
Park, Taeun
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https://hdl.handle.net/2142/21002
Description
Title
Development of analytical model relating compressive strength in porous ceramics to mercury intrusion porosimetry-derived microstructural parameters
Author(s)
Park, Taeun
Issue Date
1993
Doctoral Committee Chair(s)
Buchanan, Relva C.
Department of Study
Materials Science and Engineering
Discipline
Materials Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
The Ryshkewitch equation, $\sigma$ = $\sigma\sp\circ$ exp($-\beta$P), has been a classical formula representing the strength of porous ceramic materials. Here $\beta$ is an empirical constant. Hence this equation lacks the capability of relating microstructure to actual strengths, especially with regard to $\beta$. Correspondingly, this research focused on the relationship between $\beta$ and the microstructure of porous ceramics.
The porous ceramic materials were fabricated by using diatomaceous earth, vermiculite, kaolin and glass frit. To characterize the microstructure of the porous ceramics, MIP (Mercury Intrusion Porosimetry) was used. With the aid of statistical analysis (multiple linear regression), the following formula was derived: $\sigma = \sigma\sp*$exp($-\beta\sp*$ P) where $\sigma\sp* = \sigma\sp\circ$ for polycrystalline system, and 2.68 $\sigma\sp\circ$ for glass system and $$\beta\sp* = 3.55 + \rm {19.1S\sb{l} + 5. 06r\sb2\sp\prime + 0.076R\sb3\over P}.$$Here S$\sb\ell$,r$\sb2\sp\prime$, and R$\sb3$ are MIP-derived microstructural parameters. The above equation predicted the compressive strength within 30% for the porous fabricated ceramics and also for hardened cements.
With respect to the optimization of strength/weight ratio, the porous ceramics fabricated in this research showed high strength/density ratio ranging from 2000-40000 psi $\cdot$ cm$\sp3$/g. This ratio is higher than conventional sintered lightweight ceramics by a factor of 2 and than lightweight concrete by an order of magnitude.
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