EFFECT OF DOLOMITE TYPE AND Al2O3 CONTENT ON THE PHASE COMPOSITION IN ALUMINOUS CEMENTS CONTAINING SPINEL

The effect of dolomite type and Al2O3 content on the phase composition of aluminous cements containing MA spinel was investigated. Raw and calcined dolomites were used as raw materials along with calcined alumina in the preparation of the cement. Different compositions were prepared by sintering at...

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Bibliographic Details
Published in:Ceramics (Praha) 2011-01, Vol.55 (2), p.169-175
Main Authors: Pouyamehr, M R, Nemati, Z A, Faghihi, Sani M A, Naghizadeh, R
Format: Article
Language:English
Subjects:
Aluminous cement
Aluminous cements
Aluminum oxide
C12A7
Cements
Dolomite
Phase composition
Raw materials
Roasting
Spinel
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Summary:The effect of dolomite type and Al2O3 content on the phase composition of aluminous cements containing MA spinel was investigated. Raw and calcined dolomites were used as raw materials along with calcined alumina in the preparation of the cement. Different compositions were prepared by sintering at 1350 C and their phase compositions were determined by XRD. Their microstructures were also evaluated. The results indicate that the raw materials used have a great effect on the type and amount of formed phases in the cement composition. Independently of the dolomite type used, a mixed phase product consisting of spinel accompanied by CA and CA2 is obtained. The CA phase content in the cement composition decreases with increasing Al2O3 in the composition. On the other hand, the CA2 phase content increases with Al2O3 addition. The results also show that the formation of C12A7 is favoured by the use of calcined dolomite.
ISSN:0862-5468
1804-5847