US4012264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Early strength cements
Assignee: Associated Portland Cement Manufacturers Ltd
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Filing: 1975-03-25
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Granted: 1977-03-15
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Expires: 1995-03-25
Abstract
Abstract An early strength hydraulic cement is disclosed in which a clinker rich in C 12 A 7 and poor in CA or C 3 A interground with Portland cement clinker, the resultant early strength cement including at least 10% by weight of C 12 A 7 with a majority of the balance being calcium silicates and including at least 10% by weight of C 3 S.
Inventors
- 👤 Ransom James Murray
- 👤 Arthur William Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:32
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/02; C04B7/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
An early strength hydraulic cement comprising a mixture of a cement prepared from a clinker rich in C 12 A 7 and poor in other calcium-aluminum compounds such as CA or C 3 A with a Portland cement, said mixture including at least 10% by weight of C 12 A 7 , a majority of the balance comprising calcium silicates and including at least 10% by weight of C 3 S.
Claim 2
Dependent Claim
71 words
An early strength hydraulic cement comprising a mixture of a cement prepared from a clinker rich in C 12 A 7 and poor in other calcium-aluminum compounds such as CA or C 3 A with a Portland cement, said mixture including at least 10% by weight of C 12 A 7 , a majority of the balance comprising calcium silicates and including at least 10% by weight of C 3 S.
Claim 3
Dependent Claim
16 words
A cement according to claim 1, comprising 15-30% by weight of C 12 A 7 .
Claim 4
Dependent Claim
12 words
A cement according to claim 2, comprising 10-70% by C 3 S.
Claim 5
Dependent Claim
20 words
A cement according to claim 1 which comprises a C 12 A 7 rich clinker interground with Portland cement clinker.
Claim 6
Dependent Claim
21 words
A cement according to claim 1, wherein the clinker rich in C 12 A 7 incorporates a β-C 2 S stabilizer.
Claim 7
Dependent Claim
18 words
A cement according to claim 5, wherein the β-C 2 S stabilizer is P 2 O 5 .
Claim 8
Dependent Claim
27 words
A cement according to claim 1 incorporating sufficient calcium sulfate to give a total SO 3 content of up to 7.5% by weight in the finished cement.
Claim 9
Dependent Claim
24 words
A cement according to claim 3 incorporating sufficient calcium sulphate to give a total SO 3 content of about 2.5% in the finished cement.
Claim 10
Dependent Claim
10 words
A cement according to claim 1 incorporating a setting retarder.
Claim 11
Dependent Claim
12 words
A cement according to claim 9 wherein the retarder is citric acid.
Claim 12
Dependent Claim
10 words
A cement according to claim 1 incorporating a setting accelerator.
Claim 13
Dependent Claim
12 words
A cement according to claim 11 wherein the accelerator is potassium sulphate.
References Cited (Backward Citations)
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US3360594A
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US3645750A
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US3607325A
Cited
US3664854A
Cited
US3705815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |