US4204875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious compositions
Assignee: STWB Inc
•
Filing: 1977-06-22
•
Granted: 1980-05-27
•
Expires: 1997-06-22
Abstract
Abstract A method for preventing shrinkage of alkaline aqueous hydraulic cementitious mixtures during setting and hardening which comprises incorporating in the mixtures a monopersulfate salt, or a monopersulfate salt together with at least one peroxygen compound other than the monopersulfate salt; and hydraulic cement compositions for preparing such alkaline aqueous hydraulic cementitious mixtures. The monopersulfate salt, or monopersulfate salt together with at least one peroxygen compound other than monopersulfate salt, generates sufficient oxygen gas during setting and hardening of the alkaline aqueous hydraulic cementitious mixture to provide controlled expansion of the mixture.
Inventors
- 👤 Miklos Szalavitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:59
CPC Classifications
C; C04; C04B; C04B22/00; C04B22/08; C04B22/14; C04B22/0013; C04B22/06; C04B22/068; C04B24/00; C04B24/12; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
92 words
A hydraulic cement composition which on mixing with water forms an alkaline aqueous hydraulic cementitious mixture which has the property of setting into a hard mass the volume of which is at least as great as the original volume of the mixture, comprising in admixture a hydraulic cement mix and an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
Claim 2
Dependent Claim
92 words
A hydraulic cement composition which on mixing with water forms an alkaline aqueous hydraulic cementitious mixture which has the property of setting into a hard mass the volume of which is at least as great as the original volume of the mixture, comprising in admixture a hydraulic cement mix and an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
Claim 3
Dependent Claim
32 words
A composition according to claim 1 wherein the monopersulfate salt is present in an amount which contains from about 0.0001 to about 1 percent by weight of the composition of available oxygen.
Claim 4
Dependent Claim
32 words
A composition according to claim 2 wherein the monopersulfate salt is present in an amount which contains from about 0.0008 to about 0.03 percent by weight of the composition of available oxygen.
Claim 5
Dependent Claim
11 words
A composition according to claim 1 which additionally includes iron filings.
Claim 6
Dependent Claim
50 words
A composition according to claim 4 wherein the monopersulfate salt is present in an amount which contains from about 0.0001 to about 1 percent by weight of the composition of available oxygen and which contains from about 5 to about 95 percent by weight of the composition of iron filings.
Claim 7
Dependent Claim
32 words
A composition according to claim 5 wherein the monopersulfate salt is present in an amount which contains from about 0.0008 to about 0.03 percent by weight of the composition of available oxygen.
Claim 8
Dependent Claim
59 words
A composition according to claim 1 wherein the oxygen gas generating agent additionally includes at least one peroxygen compound other than the monopersulfate salt selected from the group consisting of inorganic peroxides of metals of Groups I and II of the Periodic Table, alkali metal salts of inorganic peroxy acids, ammonium salts of inorganic peroxy acids and urea peroxide.
Claim 9
Dependent Claim
59 words
A composition according to claim 7 wherein the monopersulfate salt is present in an amount which contains from about 0.0001 to about 1 percent by weight of the composition of available oxygen and the other peroxygen compound is present in an amount which contains from about 0.0002 to about 2 percent by weight of the composition of available oxygen.
Claim 10
Dependent Claim
21 words
A composition according to claim 8 wherein the other peroxygen compound is selected from the group consisting of alkali metal perborates.
Claim 11
Dependent Claim
59 words
A composition according to claim 9 wherein the monopersulfate salt is present in an amount which contains from about 0.0008 to about 0.03 percent by weight of the composition of available oxygen and the alkali metal perborate is present in an amount which contains from about 0.002 to about 0.08 percent by weight of the composition of available oxygen.
Claim 12
Dependent Claim
14 words
A composition according to claim 10 wherein the alkali metal perborate is sodium perborate.
Claim 13
Dependent Claim
11 words
A composition according to claim 7 which additionally includes iron filings.
Claim 14
Dependent Claim
76 words
A composition according to claim 12 wherein the monopersulfate salt is present in an amount which contains from about 0.0001 to about 1 percent by weight of the composition of available oxygen, the other peroxygen compound is present in an amount which contains from about 0.0002 to about 2 percent by weight of the composition of available oxygen, and which contains from about 5 to about 95 percent by weight of the composition of iron filings.
Claim 15
Dependent Claim
21 words
A composition according to claim 13 wherein the other peroxygen compound is selected from the group consisting of alkali metal perborates.
Claim 16
Dependent Claim
59 words
A composition according to claim 14 wherein the monopersulfate salt is present in an amount which contains from about 0.0008 to about 0.03 percent by weight of the composition of available oxygen and the alkali metal perborate is present in an amount which contains from about 0.002 to about 0.08 percent by weight of the composition of available oxygen.
Claim 17
Dependent Claim
14 words
A composition according to claim 15 wherein the alkali metal perborate is sodium perborate.
Claim 18
Independent Claim
73 words
A method for preventing shrinkage during setting and hardening of an alkaline aqueous hydraulic cementitious mixture obtained by mixing water with a hydraulic cement mix which comprises incorporating in said mixture an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
Claim 19
Independent Claim
73 words
A method for preventing shrinkage during setting and hardening of an alkaline aqueous hydraulic cementitious mixture obtained by mixing water with a hydraulic cement mix which comprises incorporating in said mixture an agent which generates oxygen gas under the alkaline conditions of the mixture, where said agent is a monopersulfate salt and is present in an amount which will generate sufficient oxygen gas to prevent shrinkage of the mixture during setting and hardening.
Claim 20
Dependent Claim
33 words
A method according to claim 17 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0001 to about 1 percent by weight of the cement mix of available oxygen.
Claim 21
Dependent Claim
33 words
A method according to claim 18 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0008 to about 0.03 percent by weight of the cement mix of available oxygen.
Claim 22
Dependent Claim
12 words
A method according to claim 17 wherein iron filings additionally are incorporated.
Claim 23
Dependent Claim
55 words
A method according to claim 20 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0001 to about 1 percent by weight of the cement mix of available oxygen, and the iron filings are incorporated in an amount of about 5 to about 95 percent by weight of the cement mix.
Claim 24
Dependent Claim
33 words
A method according to claim 21 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0008 to about 0.03 percent by weight of the cement mix of available oxygen.
Claim 25
Dependent Claim
59 words
A method according to claim 17 wherein the oxygen gas generating agent additionally includes at least one peroxygen compound other than the monopersulfate salt selected from the group consisting of inorganic peroxides of metals of Groups I and II of the Periodic Table, alkali metal salts of inorganic peroxy acids, ammonium salts of inorganic peroxy acids and urea peroxide.
Claim 26
Dependent Claim
61 words
A method according to claim 23 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0001 to about 1 percent by weight of the cement mix of available oxygen and the other peroxygen compound is incorporated in an amount which contains from about 0.0002 to about 2 percent by weight of the cement mix of available oxygen.
Claim 27
Dependent Claim
21 words
A method according to claim 24 wherein the other peroxygen compound is selected from the group consisting of alkali metal perborates.
Claim 28
Dependent Claim
61 words
A method according to claim 25 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0008 to about 0.03 percent by weight of the cement mix of available oxygen and the alkali metal perborate is present in an amount which contains from about 0.002 to about 0.08 percent by weight of the cement mix of available oxygen.
Claim 29
Dependent Claim
14 words
A method according to claim 26 wherein the alkali metal perborate is sodium perborate.
Claim 30
Dependent Claim
13 words
A method according to claim 23 wherein the iron filings additionally are incorporated.
Claim 31
Dependent Claim
82 words
A method according to claim 28 wherein the monopersulfate salt is incorporated in an amount which contains from about 0.0001 to about 1 percent by weight of the cement mix of available oxygen, the other peroxygen compound is incorporated in an amount which contains from about 0.0002 to about 2 percent by weight of the cement mix of available oxygen, and the iron filings are incorporated in an amount of about 5 to about 95 percent by weight of the cement mix.
Claim 32
Dependent Claim
21 words
A method according to claim 29 wherein the other peroxygen compound is selected from the group consisting of alkali metal perborates.
Claim 33
Dependent Claim
61 words
A method according to claim 30 where the monopersulfate salt is incorporated in an amount which contains from about 0.0008 to about 0.03 percent by weight of the cement mix of available oxygen and the alkali metal perborate is incorporated in an amount which contains from about 0.002 to about 0.08 percent by weight of the cement mix of available oxygen.
Claim 34
Dependent Claim
14 words
A method according to claim 31 wherein the alkali metal perborate is sodium perborate.
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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |