Patent US3861928A successfully refreshed from Google Patents.
US3861928A
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Hydraulic cement and method of producing same
Assignee: Calaveras Cement Corp
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Filing: 1972-08-04
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Granted: 1975-01-21
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Expires: 1992-08-04
Abstract
Abstract Ground mixtures of conventional Portland cement-making components are mixed with relatively small amounts of boroncontaining components, and the mixtures are burned at kiln temperatures substantially below those normally utilized to form clinker. The resultant clinker is more easily grindable than that produced in conventional processes of Portland cement production, and the cement resulting from the grinding of the clinker yields cementitious products possessing substantially higher compressive strength than is exhibited by Portland cement made from the same components in the absence of the boron-containing component.
Inventors
- 👤 Thomas C Slater
- 👤 Jr Floyd C Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:17
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/02
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
18 words
A hydraulic cement composition according to claim 1 substantially free from tricalcium silicate and from beta dicalcium silicate.
Claim 2
Dependent Claim
25 words
A hydraulic cement composition according to claim 1 wherein the amount of free lime is less than about 2 percent by weight of said composition.
Claim 3
Dependent Claim
11 words
A hydraulic cement composition according to claim 1 further containing borate.
Claim 4
Dependent Claim
27 words
A hydraulic cement composition according to claim 4 wherein said borate calculated as B2O3 is about 1 percent to about 3 percent by weight of said composition.
Claim 5
Dependent Claim
20 words
A hydraulic cement composition according to claim 5 wherein said borate is in solid solution in said alpha-prime dicalcium silicate.
Claim 6
Dependent Claim
21 words
A hydraulic cement composition according to claim 5 wherein said borate is B2O3 in solid solution in said alpha-prime dicalcium silicate.
Claim 7
Dependent Claim
32 words
A Portland-type cement composition containing alpha-prime dicalcium silicate as a hydraulically settable calcium silicate in an amount by weight greater than the amount by weight of any other constituent in said composition.
Claim 8
Dependent Claim
26 words
A Portland-type cement composition according to claim 8 wherein said alpha-prime dicalcium silicate is about 65 percent to about 85 percent by weight of said composition.
Claim 9
Dependent Claim
18 words
A Portland-type cement composition according to claim 8 substantially free from tricalcium silicate and from beta dicalcium silicate.
Claim 10
Dependent Claim
25 words
A Portland-type cement composition according to claim 8 wherein the amount of free lime is less than about 2 percent by weight of said composition.
Claim 11
Dependent Claim
11 words
A Portland-type cement composition according to claim 8 further containing borate.
Claim 12
Dependent Claim
27 words
A Portland-type cement composition according to claim 12 wherein said borate calculated as B2O3 is about 1 percent to about 3 percent by weight of said composition.
Claim 13
Dependent Claim
20 words
A Portland-type cement composition according to claim 13 wherein said borate is in solid solution in said alpha-prime dicalcium silicate.
Claim 14
Dependent Claim
21 words
A Portland-type cement composition according to claim 13 wherein said borate is B2O3 in solid solution in said alpha-prime dicalcium silicate.
Claim 15
Dependent Claim
49 words
A hydraulic cement composition containing tricalcium aluminate, tetracalcium aluminoferrite and alpha-prime dicalcium silicate as hydraulically settable components and being substantially free from tricalcium silicate, and wherein said alpha-prime dicalcium silicate is present in an amount by weight greater than the amount bY weight of either said aluminate or aluminoferrite.
Claim 16
Dependent Claim
26 words
A hydraulic cement composition according to claim 16 wherein said alpha-prime dicalcium silicate is about 65 percent to about 85 percent by weight of said composition.
Claim 17
Dependent Claim
14 words
A hydraulic cement composition according to claim 16 substantially free from beta dicalcium silicate.
Claim 18
Dependent Claim
25 words
A hydraulic cement composition according to claim 16 wherein the amount of free lime is less than about 2 percent by weight of said composition.
Claim 19
Dependent Claim
11 words
A hydraulic cement composition according to claim 16 further containing borate.
Claim 20
Dependent Claim
27 words
A hydraulic cement composition according to claim 20 wherein said borate calculated as B2O3 is about 1 percent to about 3 percent by weight of said composition.
Claim 21
Dependent Claim
20 words
A hydraulic cement composition according to claim 21 wherein said borate is in solid solution in said alpha-prime dicalcium silicate.
Claim 22
Dependent Claim
21 words
A hydraulic cement composition according to claim 21 wherein said borate is B2O3 in solid solution in said alpha-prime dicalcium silicate.
Claim 23
Independent Claim
126 words
A method of making a Portland-type hydraulic cement that contains alpha-prime dicalcium silicate as a hydraulically settable calcium silicate which comprises forming an admixture of pulverized lime-containing material, silicon oxide-containing material, aluminum oxidecontaining material, iron oxide-containing material and a boron-containing substance sufficient to provide at least about 1% by weight of B2O3 in said admixture, proportioning the amounts of said materials in said admixture stoichiometrically on the basis of potential tricalcium aluminate, tetracalcium aluminoferrite and alpha-prime dicalcium silicate compounds and borate at a ratio of five mols of calcium oxide per mol of B2O3, heating said admixture to fuse the components thereof into clinker and to form said alpha-prime dicalcium silicate in an amount greater than the amount of any other constituent, and grinding said clinker.
Claim 24
Dependent Claim
39 words
A method according to claim 24 wherein said boroncontaining substance is an oxide of boron, a compound containing an oxide of boron or a compound that yields an oxide of boron at the temperatures prevailing in a cement kiln.
Claim 25
Dependent Claim
47 words
A method according to claim 24 wherein said boroncontaining substance is boric acid anhydride, an acid of boric acid anhydride, a salt of boric acid anhydride, a polyboric acid, a polyborate of ammonium, sodium, potassium, calcium, barium, strontium or magnesium, a boron-containing mineral or a boroncontaining ore.
Claim 26
Dependent Claim
18 words
A method according to claim 24 wherein said boron-containing substance is boron trioxide, raw colemanite or refined colemanite.
Claim 27
Dependent Claim
27 words
A method according to claim 24 wherein the amount of said boron-containing substance as B2O3 is in the range of about 1 percent to about 3 percent.
Claim 28
Dependent Claim
17 words
A method according to claim 24 wherein said pulverized materials are limestone, silica, alumina and iron oxide.
Claim 29
Dependent Claim
15 words
A method according to claim 24 wherein said admixture is heated at above about 2350*F.
Claim 30
Dependent Claim
15 words
A method according to claim 24 wherein said admixture is heated at below about 2750*F.
Claim 31
Dependent Claim
18 words
A method according to claim 24 wherein said admixture is heated at between about 2350*F. and about 2550*F.
References Cited (Backward Citations)
US3663286A
Cited
US3682669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |