Permeability of High-Alumina Refractory Castables Based on Various Hydraulic Binders期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Permeability of High-Alumina Refractory Castables Based on Various Hydraulic Binders

Authors:	Murilo D M Innocentini Arturo R F Pardo Victor C Pandolfelli Bruno A Menegazzo Luis R M Bittencourt Roberto P Rettore

Affiliation:	Department of Materials Engineering, Federal University of São Carlos, São Carlos, São Paulo 13565–905, Brazil;Alcoa Alumínio S.A., São Paulo, São Paulo 05804–900, Brazil;Magnesita Research Center, Contagem, Minas Gerais, 32210–050, Brazil

Abstract:	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.

Keywords:	cement refractories alumina permeability calcium aluminate