US4319927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portland-type cements
Assignee: Calaveras Cement Corp
•
Filing: 1980-05-07
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Granted: 1982-03-16
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Expires: 2000-05-07
Abstract
Abstract The present invention relates to a hydraulic cement composition having a boron- and halogen-containing component and unusually high full term as well as early strengths and acceptable setting time characteristics, which cement is characterized by the presence, as hydraulically settable calcium silicates, of about 20-70 percent of alpha-prime dicalcium silicate (α'--C 2 S) and about 10-50 percent of tricalcium silicate C 3 S based upon the weight of the composition.
Inventors
- 👤 Robert M. Segal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:14
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/02; C04B7/36; C04B7/38; C04B7/42; C04B7/421
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
48 words
A hydraulic cement composition comprising as hydraulically settable calcium silicates, alpha-prime dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition.
Claim 2
Dependent Claim
48 words
A hydraulic cement composition comprising as hydraulically settable calcium silicates, alpha-prime dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition.
Claim 3
Dependent Claim
29 words
A hydraulic cement composition according to claim 1 wherein the alpha-prime dicalcium silicate and tricalcium silicate are formed and stabilized in situ in a chemical reaction during clinker formation.
Claim 4
Dependent Claim
13 words
A hydraulic cement composition according to claim 2 which is a Portland-type cement.
Claim 5
Dependent Claim
13 words
A hydraulic cement composition according to claim 3 further comprising a boron-containing component.
Claim 6
Dependent Claim
13 words
A hydraulic cement composition according to claim 4 further comprising a halogen-containing component.
Claim 7
Dependent Claim
20 words
A hydraulic cement composition according to claim 5 wherein the boron-containing component is boric oxide (B 2 O 3 ).
Claim 8
Dependent Claim
26 words
A hydraulic cement composition according to claim 6 wherein the amount of boric oxide is a minimum of about 1 percent by weight of said composition.
Claim 9
Dependent Claim
27 words
A hydraulic cement composition according to claim 7 wherein the amount of boric oxide is about 1 percent to about 2.5 percent by weight of said composition.
Claim 10
Dependent Claim
44 words
A hydraulic cement composition according to claim 6 wherein the said B 2 O 3 and lime are in solid solution in the said alpha-prime dicalcium silicate in a ratio of about five moles of lime per mole of B 2 O 3 .
Claim 11
Dependent Claim
16 words
A hydraulic cement composition according to claim 5 wherein the halogen-containing component is a calcium halide.
Claim 12
Dependent Claim
15 words
A hydraulic cement composition according to claim 9 wherein the halogen-containing component is calcium fluoride.
Claim 13
Dependent Claim
25 words
A hydraulic cement composition according to claim 8 wherein the amount of halogen is about 0.5 to about 2.0 percent by weight of said composition.
Claim 14
Dependent Claim
19 words
A hydraulic cement composition according to claim 3 having a minimum fineness of about 4,000 cm 2 /g (Blaine).
Claim 15
Dependent Claim
18 words
A hydraulic cement composition according to claim 3 having a fineness of about 4,000-6,000 cm 2 /g (Blaine).
Claim 16
Dependent Claim
25 words
A hydraulic cement composition according to claim 3 wherein the amount of free lime is less than about 2.0 percent by weight of said composition.
Claim 17
Independent Claim
178 words
A method of making a hydraulic cement composition containing as hydraulically settable calcium silicates, α' dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition which comprises: (1) forming a mixture of pulverized lime-containing component, silicon oxide-containing component, aluminum oxide-containing component, iron oxide-containing component, a halogen-containing component and a boron-containing component in an amount sufficient to provide at least about 1% by weight of B 2 O 3 in a ratio of five mols of calcium oxide per mol of B 2 O 3 ; (2) heating said mixture to a temperature of about 2,350-2,550° F. to fuse the components thereof into a clinker and to form said α' dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition; and (3) grinding said clinker.
Claim 18
Independent Claim
178 words
A method of making a hydraulic cement composition containing as hydraulically settable calcium silicates, α' dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition which comprises: (1) forming a mixture of pulverized lime-containing component, silicon oxide-containing component, aluminum oxide-containing component, iron oxide-containing component, a halogen-containing component and a boron-containing component in an amount sufficient to provide at least about 1% by weight of B 2 O 3 in a ratio of five mols of calcium oxide per mol of B 2 O 3 ; (2) heating said mixture to a temperature of about 2,350-2,550° F. to fuse the components thereof into a clinker and to form said α' dicalcium silicate in an amount of about 20 percent to about 70 percent by weight of said composition and tricalcium silicate in an amount of about 10 percent to about 50 percent by weight of said composition; and (3) grinding said clinker.
Claim 19
Dependent Claim
27 words
The method according to claim 16 wherein the α' dicalcium silicate and tricalcium silicate are formed and stabilized in situ in a chemical reaction during clinker formation.
Claim 20
Dependent Claim
13 words
The method according to claim 17 wherein the cement is a Portland-type cement.
Claim 21
Dependent Claim
18 words
The method according to claim 18 wherein the boron-containing component is boric oxide (B 2 O 3 ).
Claim 22
Dependent Claim
26 words
The process according to claim 19 wherein the amount of boric oxide is about 1 percent to about 2.5 percent by weight of the said composition.
Claim 23
Dependent Claim
14 words
The method according to claim 20 wherein the halogen-containing component is a calcium halide.
Claim 24
Dependent Claim
14 words
The method according to claim 21 wherein the halogen-containing component is a calcium fluoride.
Claim 25
Dependent Claim
24 words
The method according to claim 20 wherein the amount of halogen-containing component is about 0.5 to about 2.0 percent by weight of said composition.
Claim 26
Dependent Claim
24 words
The method according to claim 18 wherein the hydraulic cement composition is ground to a minimum fineness of about 4,000 cm 2 /g (Blaine).
Claim 27
Dependent Claim
23 words
The method according to claim 18 wherein the hydraulic cement composition is ground to a fineness of about 4,000-6,000 cm 2 /g (Blaine).
Claim 28
Dependent Claim
28 words
The method according to claim 18 wherein the amount of free lime in the hydraulic cement composition is less than about 2.0 percent by weight of said composition.
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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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |