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US4286992A
Expired / Lapsed
US
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Very high early strength cement
Assignee: United States Gypsum Co
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Filing: 1980-04-25
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Granted: 1981-09-01
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Expires: 2000-04-25
Abstract
Abstract A combination of a hydroxy polycarboxylic acid and sucrose improves the water-demand, setting, and compressive strength properties of a calcium sulfoaluminate cement to a greater degree than would be the case if the hypothetical cumulative effect of two admixtures were operative.
Inventors
- 👤 Richard E. Galer
- 👤 Paul C. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:03
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
70 words
A hydraulic cement composition comprising from about 3.75% to about 40% of 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, dicalcium silicate, from about 0.1% to about 2% of a hydroxy polycarboxylic acid, and from about 0.25% to about 4% of sucrose, said amounts being based upon the total dry weight of said composition.
Claim 2
Dependent Claim
70 words
A hydraulic cement composition comprising from about 3.75% to about 40% of 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, dicalcium silicate, from about 0.1% to about 2% of a hydroxy polycarboxylic acid, and from about 0.25% to about 4% of sucrose, said amounts being based upon the total dry weight of said composition.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein the acid is citric acid.
Claim 4
Dependent Claim
42 words
The composition of claim 2 wherein the amount of citric acid is from about 0.25% to about 1%, the amount of sucrose is from about 0.25% to about 4%, and the sucrose to acid ratio is from about 1:1 to about 6:1.
Claim 5
Dependent Claim
29 words
The composition of claim 2 wherein the amount of the citric acid is about 0.5% and the ratio of sucrose to acid is from about 1:1 to about 8:1.
Claim 6
Dependent Claim
30 words
The composition of claim 2 wherein the amount of citric acid is from about 0.1% to about 0.25% and the amount of sucrose is from about 0.25% to about 0.5%.
Claim 7
Dependent Claim
26 words
The composition of claim 2 wherein the amount of citric acid is about 1% and the amount of sucrose is from about 1% to about 3%.
Claim 8
Dependent Claim
28 words
The composition of claim 4 wherein the amount of citric acid is about 0.5% and the surcose to citric acid ratio is from about 1:1 to about 6:1.
Claim 9
Dependent Claim
22 words
The composition of claim 2 wherein the amount of citric acid is about 1% and the amount of sucrose is about 4%.
Claim 10
Dependent Claim
22 words
The composition of claim 2 wherein the amount of citric acid is about 2% and the amount of sucrose is about 2%.
Claim 11
Dependent Claim
22 words
The composition of claim 2 wherein the amount of citric acid is about 2% and the amount of sucrose is about 4%.
Claim 12
Independent Claim
76 words
A method for preparing a cement composition comprising mixing from about 3.75% to about 40% , based on the total dry weight of the composition, of 3CaO.3Al 2 O 3 .CaSO 4 with from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, from about 0.1% to about 2% of a hydroxy polycarboxylic acid, from about 0.25% to about 4% of sucrose, and dicalcium silicate as the substantial remainder.
Claim 13
Independent Claim
76 words
A method for preparing a cement composition comprising mixing from about 3.75% to about 40% , based on the total dry weight of the composition, of 3CaO.3Al 2 O 3 .CaSO 4 with from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, from about 0.1% to about 2% of a hydroxy polycarboxylic acid, from about 0.25% to about 4% of sucrose, and dicalcium silicate as the substantial remainder.
Claim 14
Dependent Claim
11 words
The method of claim 11 wherein said acid is citric acid.
Claim 15
Independent Claim
112 words
A method for retarding the setting of a cement composition comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of from about 0.25% to about 1% of citric acid and from about 0.25% to about 4% sucrose, based on the total dry weight of said cement and said admixtures, in which combination the ratio of sucrose to acid is from about 1:1 to about 6:1.
Claim 16
Independent Claim
112 words
A method for retarding the setting of a cement composition comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of from about 0.25% to about 1% of citric acid and from about 0.25% to about 4% sucrose, based on the total dry weight of said cement and said admixtures, in which combination the ratio of sucrose to acid is from about 1:1 to about 6:1.
Claim 17
Independent Claim
100 words
A method for reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 0.5% citric acid and from about 0.5% to about 4% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 18
Independent Claim
100 words
A method for reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 0.5% citric acid and from about 0.5% to about 4% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 19
Independent Claim
100 words
A method of reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, and about 3% to about 35% of calcium sulfate and dicalcium cilicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 1% citric acid and from about 2% to about 4% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 20
Independent Claim
100 words
A method of reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, and about 3% to about 35% of calcium sulfate and dicalcium cilicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 1% citric acid and from about 2% to about 4% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 21
Independent Claim
97 words
A method for reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silcate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 2% of citric acid and 2% of sucrose, based on the total dry weight of said cement and said admixtures.
Claim 22
Independent Claim
97 words
A method for reducing the demand for water in the formation of easily placeable cement/water mixes from a cement comprising from about 4% to about 40% of the ternary compound 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silcate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 2% of citric acid and 2% of sucrose, based on the total dry weight of said cement and said admixtures.
Claim 23
Independent Claim
94 words
A method for increasing the compressive strength, upon full or partial hydration, of a hydraulic cement comprising from about 4% to about 40% of 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 1% citric acid and from about 1% to about 3% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 24
Independent Claim
94 words
A method for increasing the compressive strength, upon full or partial hydration, of a hydraulic cement comprising from about 4% to about 40% of 3CaO.3Al 2 O 3 .CaSO 4 , from about 0.1% to about 5% of lime, from about 3% to about 35% of calcium sulfate, and dicalcium silicate as the substantial remainder, said method comprising the addition to said cement of a combination of admixtures consisting of about 1% citric acid and from about 1% to about 3% sucrose, based on the total dry weight of said cement and said admixtures.
Claim 25
Dependent Claim
13 words
A mortar comprising the hydraulic cement composition of claim 1 or claim 2.
Claim 26
Dependent Claim
12 words
A concrete prepared from the composition of claim 1 or claim 2.
Claim 27
Dependent Claim
13 words
A grout comprising the hydraulic cement composition of claim 1 or claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |