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Permeability of High‐Alumina Refractory Castables Based on Various Hydraulic Binders
Author(s) -
Innocentini Murilo D. M.,
Pardo Arturo R. F.,
Pandolfelli Victor C.,
Menegazzo Bruno A.,
Bittencourt Luis R. M.,
Rettore Roberto P.
Publication year - 2002
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.1151-2916.2002.tb00306.x
Subject(s) - sintering , materials science , aluminate , refractory (planetary science) , permeability (electromagnetism) , cement , porosity , composite material , chemical engineering , chemistry , biochemistry , membrane , engineering
This work investigated the changes in the permeability of high‐alumina self‐flowing refractory castables based on calcium aluminate cement (CAC) and hydratable alumina binder (HAB) pretreated between 110° and 1650°C. Permeability constants k 1 and k 2 were fitted from Forchheimer's equation based on airflow tests conducted at room temperature. The results indicated that dehydration was the main contributing factor for increased permeability in bodies pretreated up to 600°C and that sintering effects prevailed between 900° and 1650°C. Castables based on HAB were less permeable than those based on CAC, a behavior ascribed to the type of hydrates formed and to the particle‐packing features of the matrix and the matrix–aggregate interfaces.