IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0095219
(2002-03-11)
|
발명자
/ 주소 |
- Frailey, Max L.
- Wheeler, John G.
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
23 |
초록
▼
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 subjec
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° F. and 1300° F. and contains between 40% and 45% hollow spheres unable to pass νm;325 sieve. The portland cement clinker, calcium sulfate and volcanic ash are interground to an ultimate blaine fineness of between 350 m2/kg and 500 m2/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.
대표청구항
▼
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 subjec
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° F. and 1300° F. and contains between 40% and 45% hollow spheres unable to pass νm;325 sieve. The portland cement clinker, calcium sulfate and volcanic ash are interground to an ultimate blaine fineness of between 350 m2/kg and 500 m2/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. 974455, 19901200, McGowan et al., 073/863.12; US-5131260, 19920700, Brand et al., 073/031.07; US-5355719, 19941000, Kohsaka et al., 073/863.21; US-6022510, 20000200, Springmann, 073/863.12; US-6289752, 20010900, Nimberger et al., 073/863.11; US-6357304, 20020300, Mayeaux, 073/863.23; US-6444001, 20020900, Sheffield, 073/863.21
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