High temperature cements
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United States of America Patent
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Nov 11, 2008
Grant Date -
Jun 7, 2007
app pub date -
Oct 26, 2004
filing date -
Oct 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of designing a cement composition comprises determination of the temperature to which the composition will be exposed in situ; determination of a stable, thermodynamic equilibrium composition of a CaO--Al.sub.2O.sub.3--SiO.sub.2--H.sub.2O (CASH) mineral system in the [xonotlite/wollastonite]-grossulaire-anorthite or grossulaire-anorthite-quartz triangles of the Si--Ca--Al phase diagram with a possible contribution of iron and/or magnesium, analogous to the cement when set, at the determined temperature; determining proportions of cement and mineral oxides required to provide a mixture having the determined composition; and defining a series of particulate materials of predetermined particle sizes and densities, comprising cement and mineral oxides in the determined proportions.
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