Abstract

Hydrated calcium aluminosilicate cements have been prepared under hydrothermal conditions in the temperature range 110–450°C and pressure range 6.8–68 MPa. Bonding results from mixtures of the phases boehmite, qibbsite, C 3AH 6, X-phase, hexagonal anorthite, anorthite and quartz which are formed in various combinations under different conditions. Strength and other physical properties remain fairly constant throughout the range. These cements may have applications in cementing at depths in the earth or in refractory castables under elevated temperature and pressure conditions.

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