Blended hydraulic cement
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United States of America Patent
Stats
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Feb 3, 1998
Grant Date -
N/A
app pub date -
Feb 12, 1997
filing date -
Feb 12, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention is directed to blended hydraulic cement compositions which are formed with subbituminous fly ash. In a first embodiment, the cement composition comprises from about 0.1 wt. % to about 7 wt. % of a retarding agent; from about 0.1 wt. % to about 4 wt. % of the total composition of potassium carbonate; from about 0.1 wt. % to about 4 wt. % of the total composition of citric acid; and from about 85 wt. % to about 99.7 wt. % of the total composition of a subbituminous fly ash. In a second embodiment, the cement composition comprises from about 0.1 wt. % to about 7 wt % of the total composition of a retarding agent; from about 0.1 wt. % to about 6 wt. % of the total composition of an alkali source selected from the group consisting of potassium carbonate, potassium hydroxide and blends thereof; from about 0.1 wt. % to about 4 wt. % of the total composition of citric acid; from about 25 wt. % to about 91.7 wt. % of the total composition of a first subbituminous fly ash having a lime content; and from about 8 wt. % to about 60 wt. % of the total composition of a second fly ash selected from the group consisting of lignite fly ash, bituminous fly ash and scrubber material.
First Claim
Other Claims data not available