Process for producing a blended cement having enhanced cementitious properties capable of combination with class C fly ash
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United States of America Patent
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May 11, 2004
Grant Date -
Sep 19, 2002
app pub date -
Mar 11, 2002
filing date -
Mar 14, 2001
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Abstract
The present invention provides a method of producing a blended cement capable of meeting ASTM C-595 and C-1157 standards. The blended cement of the present invention contains portland cement clinker, calcium sulfate and volcanic ash. The volcanic ash utilized by the present invention has been subjected to heat in the range of between 800.degree. F. and 1300.degree. F. and contains between 40% and 45% hollow spheres unable to pass #325 sieve. The portland cement clinker, calcium sulfate and volcanic ash are interground to an ultimate blaine fineness of between 350 m.sup.2 /kg and 500 m.sup.2 /kg to produce a blended cement capable of subsequent admixing with class C fly ash to produce synergistic effects. Specifically, the addition of class C fly ash to the blended cement containing interground volcanic ash, portland cement clinker, and calcium sulfate is capable of producing an ultimate blended cement exhibiting improved sulfate resistance, improved workability, reduced permeability with regard to chlorides and sulfates, improved resistance to ASR and elimination of delayed ettringite formation.
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