US4019918A
Expired / Lapsed
US
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Portland cement compositions
Assignee: Lockheed Martin Corp
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Filing: 1976-02-02
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Granted: 1977-04-26
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Expires: 1996-02-02
Abstract
Abstract High strength Portland cement compositions comprised of Portland cement clinker which has been ground to a specific surface area of between about 4400 cm2/g and up to 6000 cm2/g, alkali or alkaline earth lignosulfonate in an amount of between about 0.75 and 1.25 percent by weight, sodium bicarbonate in an amount of between about 1.25 and 2.5 percent by weight, and gypsum in an amount of between about 1.5 and 4.0 percent by weight, wherein the lignosulfonate and the bicarbonate are present in a ratio of about one to two and the cement product formed has a porosity of less than about 5 percent by volume voids. The cement compositions have an adequate plastic period of from at least about 90 minutes, as well as adequate and/or improved one and twenty-eight day strengths of in excess of about 5000 psi and 6000 psi, respectively. Sand or sand, crushed rock and/or gravel can be incorporated into the cement mixes or compositions to form mortar and concrete products.
Inventors
- 👤 Milton Herman Wills, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:10
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
138 words
A high strength Portland cement mix comprising Portland cement clinker which has been ground to a specific surface area of between about 4400 cm 2 /g and 6000 cm 2 /g, alkali or alkaline earth lignosulfonate in an amount of between about 0.75 and 1.25 percent by weight, sodium bicarbonate in the amount of between about 1.5 and 2.5 percent by weight, and gypsum in an amount of between about 1.5 and 4.0 percent by weight, wherein said lignosulfonate and said bicarbonate are present in a ratio of about one to two and wherein a cement product formed from the cement mix will have a porosity of less than about 5% by volume voids, an adequate plastic period of in excess of 90 minutes, and an adequate 1-day strength of in excess of 5000 pounds per square inch.
Claim 2
Dependent Claim
138 words
A high strength Portland cement mix comprising Portland cement clinker which has been ground to a specific surface area of between about 4400 cm 2 /g and 6000 cm 2 /g, alkali or alkaline earth lignosulfonate in an amount of between about 0.75 and 1.25 percent by weight, sodium bicarbonate in the amount of between about 1.5 and 2.5 percent by weight, and gypsum in an amount of between about 1.5 and 4.0 percent by weight, wherein said lignosulfonate and said bicarbonate are present in a ratio of about one to two and wherein a cement product formed from the cement mix will have a porosity of less than about 5% by volume voids, an adequate plastic period of in excess of 90 minutes, and an adequate 1-day strength of in excess of 5000 pounds per square inch.
Claim 3
Dependent Claim
14 words
A Portland cement mix according to claim 1 wherein said lignosulfonate comprises calcium lignosulfonate.
Claim 4
Dependent Claim
15 words
A Portland Cement mix according to claim 1 wherein said gypsum is Plaster of Paris.
Claim 5
Dependent Claim
53 words
A Portland cement mix according to claim 1 wherein said lignosulfonate comprises calcium lignosulfonate and is in an amount of 1.0 percent by weight, said sodium bicarbonate is in an amount of 2.0 percent by weight, and said gypsum is Plaster of Paris and is in an amount of 4.0 percent by weight.
Claim 6
Dependent Claim
15 words
A cement mix according to claim 1 further including enough water to effect hydration thereof.
Claim 7
Dependent Claim
144 words
A high strength concrete mix comprising a Portland cement clinker which has been ground to a specific surface area of between about 4400 cm 2 /g, and 6000 cm 2 /g, alkali or alkaline earth lignosulfonate in an amount of between about 0.75 and 1.25 percent by weight, sodium bicarbonate in an amount of between about 1.5 and 2.5 percent, and gypsum in an amount of between about 1.5 and 4.0 percent by weight, in admixture with sand and crushed stone or gravel, wherein said lignosulfonate and said bicarbonate are present in a ratio of about one to two and wherein a concrete product formed from the concrete mix has a porosity of less than about 5% by volume voids, an adequate plastic period of in excess of 90 minutes and an adequate 1-day strength of in excess of 5000 pounds per square inch.
Claim 8
Dependent Claim
144 words
A high strength concrete mix comprising a Portland cement clinker which has been ground to a specific surface area of between about 4400 cm 2 /g, and 6000 cm 2 /g, alkali or alkaline earth lignosulfonate in an amount of between about 0.75 and 1.25 percent by weight, sodium bicarbonate in an amount of between about 1.5 and 2.5 percent, and gypsum in an amount of between about 1.5 and 4.0 percent by weight, in admixture with sand and crushed stone or gravel, wherein said lignosulfonate and said bicarbonate are present in a ratio of about one to two and wherein a concrete product formed from the concrete mix has a porosity of less than about 5% by volume voids, an adequate plastic period of in excess of 90 minutes and an adequate 1-day strength of in excess of 5000 pounds per square inch.
Claim 9
Dependent Claim
28 words
A concrete mixture according to claim 6 wherein said ground Portland cement clinker is present in an amount of between about 5 and 8 sacks per cubic yard.
Claim 10
Dependent Claim
24 words
A concrete mix according to claim 6 wherein said Portland cement clinker is present in an amount of about 8 sacks per cubic yard.
Claim 11
Dependent Claim
13 words
A concrete mix according to claim 6 wherein said lignosulfonate comprises calcium lignosulfonate.
Claim 12
Dependent Claim
14 words
A concrete mix according to claim 6 wherein said gypsum is Plaster of Paris.
Claim 13
Dependent Claim
53 words
A concrete mix according to claim 6 wherein said lignosulfonate comprises calcium lignosulfonate and is in an amount of 1.0 percent by weight, said sodium bicarbonate is present in an amount of 2.0 percent by weight, and said gypsum is Plaster of Paris and is in an amount of 4.0 percent by weight.
Claim 14
Dependent Claim
21 words
A concrete mix according to claim 6 wherein cement and sand are present in a ratio of about 1 to 11/2.
Claim 15
Dependent Claim
15 words
A concrete mix according to claim 6 further including enough water to effect hydration thereof.
Claim 16
Dependent Claim
23 words
A concrete mix according to claim 13 wherein said water and said cement are present in a ratio of about 1 to 3.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |