Xonotlite aggregate, part I: hydrothermal synthesis
1
Instytut Ceramiki i Materiałów Budowlanych, Oddział Materiałów Ogniotrwałych w Gliwicach
Publication date: 2019-09-24
Cement Wapno Beton 24(4) 259-266 (2019)
KEYWORDS
ABSTRACT
In connection with the perspective importance of xonotlite for the national economy, the study of its thermal synthesis, was undertaken. In the experiments the commonly accessible raw materials were used, namely the quartz sand, ground to the particles sizes under 0.2 μm and slaked lime. In order to totally eliminate the carbonates from lime, it was preliminary burned at 1000oC and the xonotlitu synthesis was conducted in the argon atmosphere. The experiments have shown that the hydrothermal synthesis, under the pressure of 3 MPa and during the period of 10 hours, is sufficient for the crystalline xonotlite formation, with the fibrous morphology. However, the time elongation to 24 hours, was changing very much the crystals sizes and morphology.
ACKNOWLEDGEMENTS
The fi nancial support from Institute of Ceramics and Building Materials, Refractory Division in Gliwice, is greatly acknowledged.
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