Formulation of Calcium dialuminate (CaOÃ¢ÂÂ¢2Al2O3) refractory cement from local bauxite
International Conference on Materials Science and Materials Chemistry
August 20-21, 2018 | Paris, France
A B Tchamba, J C Sofack, R Yongue and U C Melo
University of Yaounde, Cameroon
Posters & Accepted Abstracts : Mater Sci Nanotechnol
Three types of bauxites containing aluminium hydroxide of 58.1% gibbsite and 19.3% boehmite for BX3, 95.5% of gibbsite for BX55 and 84.5% of gibbsite for BX8 were used with lime at 95% of CaO through solid state sintering in one stage to prepare a refractory clinker at 1550°C. The powder obtained after grinding the clinker showed in the XRD curves the presence of CaO•2Al2O3 and CaO•TiO2 phases in the cement samples. The density of cement powder varied between 2.95 and 3.17 g/ cm3and the specific area of the powder obtained after grinding was between 0.72 and 0.85 m2/g. The properties of hydrated cement, W/C = 0.33, after stabilization of cement components for 48 h at 105°C were showed by XRD, DTA, DTG and SEM (C3AH6, AH3, CA2 and CaO•TiO2). The Young’s modulus of the cement made varied between 35.5 and 39.4 GPa, and these Young’s moduli were compared to conventional CA14M cement.