2026-09-21T01:37:16Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/21002 2023-07-10 col_2142_5131 col_2142_13836 com_2142_5130 com_2142_13835 com_2142_234

Buchanan, Relva C. Park, Taeun 2011-05-07T12:55:27Z 2011-05-07T12:55:27Z 10000-01-01 1993 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. Made available in DSpace on 2011-05-07T12:55:27Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9411747.pdf: 7313081 bytes, checksum: 05058a51c039f977a4b4ef4c1e40bdd5 (MD5) Previous issue date: 1993 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:47:49Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:21:37-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9411747 (UMI)AAI9411747 http://hdl.handle.net/2142/21002 eng Copyright 1993 Park, Taeun Engineering, Materials Science Development of analytical model relating compressive strength in porous ceramics to mercury intrusion porosimetry-derived microstructural parameters text Materials Science and Engineering Materials Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.