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Title: Crystallization of belite–melilite clinker minerals in the presence of liquid phase

Crystallization of belite–melilite clinker minerals was studied from the view point of a high temperature equilibrium. Ca{sub 2}SiO{sub 4}–Ca{sub 2}Al{sub 2}SiO{sub 7} and Ca{sub 2}SiO{sub 4}–Ca{sub 2}AlFeSiO{sub 7} clinkers were synthesized at 1330 °C–1650 °C. The constituent phases were determined by X-ray powder diffractometry and optical microscopy. Chemical compositions of the individual clinker minerals were determined using an electron probe microanalyzer. We established the two types of P{sub 2}O{sub 5}-bearing pseudobinary phase diagrams in the systems Ca{sub 2}SiO{sub 4}–Ca{sub 2}Al{sub 2}SiO{sub 7} at 1505 °C–1650 °C and Ca{sub 2}SiO{sub 4}–Ca{sub 2}(Al,Fe){sub 2}SiO{sub 7} at 1330 °C–1550 °C. In the latter system, the liquid phase appeared at 1390 °C, which is approximately 150 °C lower than the temperature of liquid formation in the former system. The melilite phenocrysts larger than 50 μm were observed not only in the slowly cooled Ca{sub 2}SiO{sub 4}–Ca{sub 2}(Al,Fe){sub 2}SiO{sub 7} clinker but also in commercial belite–melilite clinkers. These crystals would be nucleated and grown from a liquid phase which was formed at relatively low temperatures.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Central Research Laboratory, Taiheiyo Cement Corporation, Chiba 285-8655 (Japan)
  2. (Japan)
  3. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033 (Japan)
  4. Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
Publication Date:
OSTI Identifier:
22323144
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM SILICATES; CHEMICAL COMPOSITION; CRYSTALLIZATION; CRYSTALS; ELECTRON PROBES; LIQUIDS; MINERALS; OPTICAL MICROSCOPY; PHOSPHATES; PHOSPHORUS OXIDES; WASTE MANAGEMENT; X-RAY DIFFRACTION