[특허]Method of delaying the set time of cement and the compositions produced therefrom

[미국특허] Method of delaying the set time of cement and the compositions produced therefrom 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C04B-024/04
출원번호	US-0228009 (2002-08-26)
발명자 / 주소	Boggs, Bruce Rhodes, Douglas
출원인 / 주소	ISG Resources, Inc.
대리인 / 주소	Wegman, Hessler & Vanderbur
인용정보	피인용 횟수 : 5 인용 특허 : 40

초록 ▼

The invention pertains to a method of delaying the set time of cement and to compositions produced therefrom. The set time of hydraulic cement mixtures of fly ash pozzolans, specifically Class C and Class F, and Portland cement can be delayed by controlling the pH of a retarder slurry that is mixed with the dry components of the composition. The pH of the retarder slurry is controlled by balancing the salts therein such that the retarder slurry is acidic, or having a pH less than 7. The slurry activator of the present invention generally includes a pH balancing agent, an acid component, and water. The pH balancing agent can include any basic alkali and alkaline earth metal hydroxide, or a salt of the acid component. The acid component may include a hydroxycarboxylic acid, preferably citric acid. Slower setting mortar and concrete compositions having high strength can be prepared with this hydraulic cement.

대표청구항 ▼

1. Method of inhibiting the setting time of a hydraulic cement mixture comprising mixing said hydraulic cement mixture with a retarder slurry having an acidic pH, said retarder slurry comprising an hydroxycarboxylic acid and a pH balancing agent, said pH balancing agent comprising a member selected from the group consisting of alkali and alkaline earth metal hydroxides and salts of said acid. 2. Method as recited in claim 1 wherein said pH balancing agent comprises a salt of said hydroxycarboxylic acid.3. Method as recited in claim 2 wherein said acid comprises at least two carboxy functional groups.4. Method as recited in claim 3 wherein said acid comprises a member selected from the group consisting of citric, malic, malonic, glyoxylic and glycolic acids.5. Method as recited in claim 4 wherein said acid is citric acid.6. Method as recited in claim 5 wherein said pH is about 4 to about 6.7. Method as recited in claim 6 wherein said retarder slurry further comprises a member selected from sugar and metal salts.8. Method as recited in claim 1 wherein about 1-12 wt % of said retarder slurry is mixed with about 100 parts by weight of said hydraulic cement mixture.9. Retarder slurry composition for delaying the setting time of a hydraulic cement mixture, said retarder slurry having an acidic pH and comprising an hydroxycarboxylic acid and a pH balancing agent said pH balancing agent comprising a member selected from the group consisting of alkali and alkaline earth metal hydroxides and salts of said acid. 10. Composition as recited in claim 9 wherein said pH balancing agent comprises a salt of said hydroxycarboxylic acid.11. Composition as recited in claim 9 wherein said hydroxycarboxylic acid comprises at least two carboxy functional groups.12. Composition as recited in claim 11 wherein said hydroxycarboxylic acid comprises a member selected from the group consisting of citric, malic, malonic, glyoxylic and glycolic acids.13. Method as recited in claim 12 wherein said hydroxycarboxylic acid is citric acid.14. Method as recited in claim 13 wherein said pH is about 4 to about 6.15. Method as recited in claim 14 wherein said retarder slurry further comprises a member selected from sugar and metal salts.

이 특허에 인용된 특허 (40) 인용/피인용 타임라인 분석

Roy Amitava (Baton Rouge LA) Schilling Paul J. (Baton Rouge LA) Eaton Harvill C. (Baton Rouge LA), Alkali activated class C fly ash cement.
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Roy Amitava (Baton Rouge LA) Schilling Paul J. (Baton Rouge LA) Eaton Harvill C. (Baton Rouge LA), Alkali activated class C fly ash cement.
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Styron Robert William, Blended hydraulic cement.
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Styron Robert William, Blended hydraulic cement.
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Kirkpatrick William D. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062) Kirkpatrick Carole W. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062), Blended hydraulic cement for both general and special applications.
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Heitzmann Richard F. (Pearland TX) Gravitt Billy B. (Katy TX) Sawyer James L. (Friendswood TX), Cement composition curable at low temperatures.
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Turpin ; Jr. Raymond C. (3825 Wieuca Ter. ; NW. Atlanta GA 30342), Cement compositions containing self-setting pozzolans.
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Yamagisi Hirosi (Oumi JPX) Sakamaki Shozo (Oumi JPX) Nakagawa Koji (Oumi JPX) Sirasawa Minoru (Oumi JPX), Cement retarder and rapid hardening cement containing the same.
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Berry William A. (Burlington CAX), Cementitious binder for consolidated fill.
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Harris Harry A. (Leawood KS), Cementitious composition.
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Brook John W. (Mantua OH) Factor David F. (Hiram OH) Kinney Frederick D. (Broadview Hts. OH) McCallen Celeste L. (Wexford PA) Young Andrea M. (Redondo Beach CA), Cementitious compositions.
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Brook John W. (Mantua OH) Factor David F. (Hiram OH) Kinney Frederick D. (Broadview Hts. all of OH) McCallen Celeste L. (Wexford PA) Young Andrea M. (Redondo Beach CA), Cementitious compositions containing fly ash.
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Stav Elisha,ILX ; Burkard Edward A. ; Finkelstein Ronald S. ; Winkowski Daniel A. ; Metz Lambert J. ; Mudd Patrick J., Cementitious gypsum-containing binders and compositions and materials made therefrom.
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Stav Elisha (Amherst NY) Burkard Edward A. (East Amherst NY) Finkelstein Ronald S. (East Amherst NY), Cementitious gypsum-containing compositions and materials made therefrom.
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Liskowitz John W. (Belle Mead NJ) Wecharatana Methi (Parsippany NJ) Jaturapitakkul Chai (Bangkok THX) Cerkanowicz ; deceased Anthony E. (late of Livingston NJ by Elizabeth M. Cerkanowicz ; executrix , Compressive strength of concrete and mortar containing fly ash.
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Styron Robert William, Fly ash composition.
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Robert William Styron, Fly ash composition for use in concrete mix.
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Francis Hubert C. (Lithonia GA) Ksionzyk Anne H. (Decatur GA), Flyash-based compositions.
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Gravitt Billy B. (Katy TX) Heitzmann Richard F. (Pearland TX) Sawyer James L. (Friendswood TX), Hydraulic cement and composition employing the same.
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Ulibarri Ramon Poo,MXX ; Gonzalez Waltter Lopez,MXX ; Torres Jose,MXX, Hydraulic cement with accelerated high strength development.
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Kunzi Robert A. (Bakersfield CA) Vinson Edward F. (Duncan OK) Totten Patty L. (Duncan OK) Brake Bobby G. (Duncan OK), Low temperature well cementing compositions and methods.
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Styron Robert William ; Abiodun Kamal Seyi, Method of making a mineral filler from fly ash.
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Styron Robert William ; Abiodun Kamal Seyi, Method of making mineral filler and pozzolan product from fly ash.
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Styron Robert William ; Hwang Jiann-Yang, Method of removing carbon from fly ash.
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Ronin Vladimir,SEX, Method of treating cement clinker.
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Heitzmann Richard E. (Pearland TX) Fitzgerald Mark (Houston TX) Sawyer James L. (Friendswood TX), Mineral binder and compositions employing the same.
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Heitzmann Richard F. (Pearland TX) Fitzgerald Mark (Houston TX) Sawyer James L. (Friendswood TX), Mineral binder and compositions employing the same.
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Riley Victor (26 Dunedin Drive Toronto ; Ontario NC CAX M8X 2K5) Muralidharan Krishnamurthy (4309-F Trinity Ave. Greensboro NC 27407), Multiple purpose patching composition.
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Hopkins Donald S. (Thornhill CAX) Oates David B. (Schomberg MN CAX) Anderson Rayburn R. (Wayzata MN) Lehoux Paul H. (Kingston CAX), Pozzolan blends.
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Styron Robert William, Process for making a blended hydraulic cement.
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Forss Bengt (Pargas FIX), Process for producing a binder for slurry, mortar, and concrete.
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Kirkpatrick William D. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062) Kirkpatrick Carole W. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062), Process for producing a hydraulic cement binder for both general and special applications.
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Kirkpatrick William D. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062) Kirkpatrick Carole W. (1431 S. Ocean Blvd. ; #10 Pompano Beach FL 33062), Process for producing a hydraulic cement binder for both general and special applications.
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Furlong Tresea (Nacogdoches TX) Hearne John (Nacogdoches TX), Process for producing solid bricks from fly ash, bottom ash, lime, gypsum, and calcium carbonate.
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Hums Dieter,DEX ; Lippe Klaus F.,DEX, Process for the manufacture of construction materials.
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Bloss Wolfgang (Reichshof DEX), Process with calcium sulfite hemihydrate in a powdery byproduct from dry flue gas desulfurization for the production of.
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Patel Jashbhai M. (Amherst NY), Ready mixed setting-type joint compound and method of making same.
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Patel Jashbhai M., Ready mixed setting-type joint compound, and method of making same.
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Bury Jeffrey ; Factor David F. ; Grauer Zvi, Unitized cement admixture.
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Styron Robert W. (Marietta GA), Use of alumina clay with cement fly ash mixtures.
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이 특허를 인용한 특허 (5) 인용/피인용 타임라인 분석

Lloyd, Redmond Richard; Keyte, Louise Margaret; Hill, Russell L.; Zhang, Zhaozhou; Hollett, Mark; Ai, Li, Calcium sulfoaluminate cement-containing inorganic polymer compositions and methods of making same.
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Bingamon, Arlen Earl; Morrical, Stephen C.; Innis, Francis Allison; Sorcic, Anthony Martin, Cementitious compositions for oil well cementing applications.
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Bingamon,Arlen Earl; Morrical,Stephen C.; Innis,Francis Allison; Sorcic,Anthony Martin, Cementitious compositions for oil well cementing applications.
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Diaz-Loya, Ivan; Patel, Rajeshkumar; Hoffman, David; Trzpekowski, Joseph; Kinney, Frederick, Highly workable, high strength cement compositions.
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Hill, Russell L.; Majors, Russ, Inorganic polymer/organic polymer composites and methods of making same.
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[미국특허] Method of delaying the set time of cement and the compositions produced therefrom 원문보기

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[미국특허] Method of delaying the set time of cement and the compositions produced therefrom 원문보기

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