Blended fly ash pozzolans
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United States of America Patent
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N/A
Issued Date -
Sep 14, 2006
app pub date -
Mar 8, 2005
filing date -
Mar 8, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Novel premium blended pozzolans for use with hydraulic cement are created by intergrinding an ASTM Class F or Class C coal fly ash and a source of calcium sulfate, such as gypsum, so that the resultant mixture has a fineness of at least 90% passing through a 45 micron sieve. The novel mixture meets the requirements of ASTM C 618. Alternately, a novel concrete composition can be formed using the blended pozzolan with a hydraulic cement, aggregate and water so as to produce a concrete having improved strength, ASR mitigation, improved sulfate resistance and lowered permeability. The novel pozzolans not only reduce production costs by decreasing fuel and raw material consumption per ton of cement, but they also use by-product waste materials from another industry to create a premium product for the construction industry.
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