US4842649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement composition curable at low temperatures
Assignee: Lone Star Industries Inc
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Filing: 1987-10-02
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Granted: 1989-06-27
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Expires: 2007-10-02
Abstract
Abstract A blended hydraulic cement composition, curable at low temperatures, including temperatures below the freezing point of water, is composed of portland cement, slag, pozzolans including metakaolin, and admixtures including potassium carbonate and water reducing compositions. The cement is particularly useful in producing concrete compositions which achieve high strength in a brief period of time, and continue curing at ambient temperatures, and temperatures below the freezing point of water.
Inventors
- 👤 Richard F. Heitzmann
- 👤 Billy B. Gravitt
- 👤 James L. Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:29
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B28/00; C04B28/02; C04B28/04; C04B2111/00; C04B2111/76; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
92 words
A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of: From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts potassium carbonate, wherein the parts of potassium carbonate plus one-half of the parts of metakaolin is equal to at least 2.
Claim 2
Dependent Claim
92 words
A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of: From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts potassium carbonate, wherein the parts of potassium carbonate plus one-half of the parts of metakaolin is equal to at least 2.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein the admixture is citric acid in an amount of from 0.5 to 1.5 parts, by weight.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the amount of the admixture is from about 0.15 to 0.40 part, by weight.
Claim 5
Dependent Claim
19 words
The composition of claim 1 wherein the amount of portland cement is from 55 to 60 parts, by weight.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein the amount of fly ash is from about 20 to 30 parts, by weight.
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein the amount of metakaolin is from about 4 to 6 parts, by weight.
Claim 8
Dependent Claim
19 words
The composition of claim 1 wherein the amount of slag is from about 4 to 5 parts, by weight.
Claim 9
Dependent Claim
20 words
The composition of claim 1 wherein up to one-third of the potassium carbonate is replaced by an alkali metal hydroxide.
Claim 10
Dependent Claim
92 words
A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of: From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts sodium carbonate, wherein the parts of sodium carbonate plus one-half of the parts of metakaolin is equal to at least 2.
Claim 11
Dependent Claim
92 words
A blended hydraulic cement composition, capable of curing at temperatures below freezing, consisting essentially of: From 50 parts to about 80 parts portland cement From 13 parts to about 35 parts fly ash From 0 parts to about 10 parts metakaolin From 0 parts to about 6 parts slag From 0 parts to 4 parts admixture, wherein said admixture is a set regulating additive, From 1 part to about 5 parts sodium carbonate, wherein the parts of sodium carbonate plus one-half of the parts of metakaolin is equal to at least 2.
Claim 12
Dependent Claim
22 words
The composition of claim 9 wherein the admixture is citric acid in an amount of from 0.5 to 1.5 parts, by weight.
Claim 13
Dependent Claim
19 words
The composition of claim 9 wherein the amount of admixture, is from about 0.15 to 0.40 parts, by weight.
Claim 14
Dependent Claim
19 words
The composition of claim 9 wherein the amount of portland cement is from 55 to 60 parts, by weight.
Claim 15
Dependent Claim
20 words
The composition of claim 9 wherein the amount of fly ash is from about 20 to 30 parts, by weight.
Claim 16
Dependent Claim
19 words
The composition of claim 9 wherein the amount of metakaolin is from about 4 to 6 parts, by weight.
Claim 17
Dependent Claim
19 words
The composition of claim 9 wherein the amount of slag is from about 4 to 5 parts, by weight.
Claim 18
Dependent Claim
20 words
The composition of claim 9 wherein up to one-third of the sodium carbonate is replaced by an alkali metal hydroxide.
References Cited (Backward Citations)
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Cited
US4306912A
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US4514228A
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JPS61155239A
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US4640715A
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US4642137A
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |