US4057608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of continuous manufacture of light-weight foamed concrete
Assignee: Misawa Homes Institute of Research and Development Co Ltd
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Filing: 1976-04-19
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Granted: 1977-11-08
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Expires: 1996-04-19
Abstract
Abstract Light-weight foamed concrete articles are advantageously manufactured in a continuous manner from a rapid setting hydraulic cement composition. The cement composition in the form of a dry powder and an aqueous foamed liquid containing a foaming agent and a setting retarder are separately and continuously introduced into a continuously stirred vessel where they are mixed into an aqueous foamed cement slurry within a short period of time. The foamed cement slurry is cast into the desired shape and, if desired, cured.
Inventors
- 👤 Akihiro Hashimoto
- 👤 Shigeo Hayashi
- 👤 Sadao Yamamoto
- 👤 Hitoshi Chujo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:47
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; B; B28; B28B; B28B1/00; B28B1/50; B28C; B28C5/00; B28C5/38; B28C5/381; B28C5/383
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A process for manufacturing light-weight foamed concrete articles which comprises the steps of: separately introducing two materials in a continuous manner at stated flow rates into a continuously stirred vessel, one of the two materials being a rapid setting hydraulic cement composition in the form of a finely divided dry powder and the other being an aqueous foamed liquid containing a foaming agent and a setting retarder; continuously withdrawing the foamed cement slurry, so prepared, from the vessel before the foamed cement slurry begins to set, and; then, placing the foamed slurry in a mold thereby to be cast therein.
Claim 2
Dependent Claim
100 words
A process for manufacturing light-weight foamed concrete articles which comprises the steps of: separately introducing two materials in a continuous manner at stated flow rates into a continuously stirred vessel, one of the two materials being a rapid setting hydraulic cement composition in the form of a finely divided dry powder and the other being an aqueous foamed liquid containing a foaming agent and a setting retarder; continuously withdrawing the foamed cement slurry, so prepared, from the vessel before the foamed cement slurry begins to set, and; then, placing the foamed slurry in a mold thereby to be cast therein.
Claim 3
Dependent Claim
73 words
A process according to claim 1 wherein said rapid setting hydraulic cement composition is at least one mixture selected from the group consisting of a mixture of alumina cement and calcium oxide or hydroxide; a mixture of alumina cement, calcium oxide or hydroxide and a hydraulic material capable of forming predominantly tobermorite group crystalline calcium silicate hydrate when cured at elevated temperature and pressure, and; a mixture of calcium haloaluminate and calcium sulfate.
Claim 4
Dependent Claim
28 words
A process according to claim 1 wherein said setting retarder is at least one compound selected from the group consisting of oxycarboxylic acids, ketocarboxylic acids and their salts.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein said setting retarder is used in an amount of 0.05 to 1% by weight based on the weight of the rapid setting hydraulic cement composition.
Claim 6
Dependent Claim
36 words
A process according to claim 1 wherein said foaming agent is at least one compound selected from the group consisting of alkylarylsulfonic acid salts, alkylsulfonic acid salts, α-sulfonated fatty acids, α-sulfonated fatty acid esters and saponin.
Claim 7
Dependent Claim
32 words
A process according to claim 1 wherein said foaming agent is used in an amount of 0.05 to 2.5% by weight based on the weight of the rapid setting hydraulic cement composition.
Claim 8
Dependent Claim
35 words
A process according to claim 1 wherein said aqueous foamed cement slurry is cast in a mold at a temperature of not higher than 40° C for a period of approximately 10 to 30 minutes.
Claim 9
Dependent Claim
34 words
A process according to claim 1 wherein the concrete cast in said mold is, after being demolded, cured in an autoclave at a temperature of 150° to 200° C and a saturated steam pressure.
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |