US3901722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a high strength concrete
Assignee: Japan National Railways
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Filing: 1973-09-27
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Granted: 1975-08-26
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Expires: 1993-09-27
Abstract
Abstract A high strength concrete is produced under such condition that the concrete is left to stand under atmosphere and a sufficient curing can not be effected by adding calcium sulfoaluminate hydrate-forming minerals to concrete materials in such a small amount that the concrete does not expand.
Inventors
- 👤 Toshiyuki Kitsuta
- 👤 Iwao Mino
- 👤 Koji Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:26
CPC Classifications
C; C04; C04B; C04B22/00; C04B22/0093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A METHOD FOR PRODUCING A HIGH COMPRESSIVE STRENGTH CONCRETE HAVING A HIGH FREEZING AND THAWING RESISTANCE UNDER THE CONDITION THAT THE CONCRETE IS LEFT TO STAND UNDER ATMOSPHERE AND A SUFFICENT CURING CAN NOT BE EFFECTED, WHICH COMPRISES BLENDING 2-13% BY WEIGHT BASED ON CEMENT OF (A) A MIXTURE OF 12CAO. 7AL2O3 NOT CONTAINING FREE-CAO AND GYPSUM OR (B) A PRODUCT NOT CONTAING FREE-CAO OBTAINED BY SIMULTANEOUSLY BURNING A MATERIAL TO FORM 12CAO. 7AL2O3 AND GYPSUM, TO PORTLAND CEMENT IN A UNIT CENENT AMOUNT OF 500 - 700 KG AND A WATER CEMENT RATIO OF 18-35%, THE WEIGHT RATIO OF 12CAO. 7A12O3 TO GYPSUM BEING 1:0,8-5, THE FINENESS IN BLAINE VALUE OF THE 12CAO. 7A12O3 BEING 4,000-8,000 CM2/G.
Claim 2
Independent Claim
118 words
A METHOD FOR PRODUCING A HIGH COMPRESSIVE STRENGTH CONCRETE HAVING A HIGH FREEZING AND THAWING RESISTANCE UNDER THE CONDITION THAT THE CONCRETE IS LEFT TO STAND UNDER ATMOSPHERE AND A SUFFICENT CURING CAN NOT BE EFFECTED, WHICH COMPRISES BLENDING 2-13% BY WEIGHT BASED ON CEMENT OF (A) A MIXTURE OF 12CAO. 7AL2O3 NOT CONTAINING FREE-CAO AND GYPSUM OR (B) A PRODUCT NOT CONTAING FREE-CAO OBTAINED BY SIMULTANEOUSLY BURNING A MATERIAL TO FORM 12CAO. 7AL2O3 AND GYPSUM, TO PORTLAND CEMENT IN A UNIT CENENT AMOUNT OF 500 - 700 KG AND A WATER CEMENT RATIO OF 18-35%, THE WEIGHT RATIO OF 12CAO. 7A12O3 TO GYPSUM BEING 1:0,8-5, THE FINENESS IN BLAINE VALUE OF THE 12CAO. 7A12O3 BEING 4,000-8,000 CM2/G.
Claim 3
Dependent Claim
56 words
A method as claimed in claim 1, wherein 0.3-5% by weight based on cement of at least one of surfactants selected from the group consisting of an anionic sulfonate, sulfuric acid ester salts, a non-ionic polyhydric alcohol, a condensate of naphthalenesulfonate and formalin, an ethylene oxide addition product and a non-ionic anionic surfactant is added thereto.
Claim 4
Dependent Claim
18 words
The method as claimed in claim 1, wherein the amount of (A) or (B) is 4-8% by weight.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein said blended concrete is concreted on site and has a compression strength at an age of 28 days of more than 800 Kg/cm2.
Claim 6
Dependent Claim
56 words
A method as claimed in claim 4, wherein 0.3-5% by weight based on cement of at least one of surfactants selected from the group consisting of an anionic sulfonate, sulfuric acid ester salts, a nonionic polyhydric alcohol, a condensate of naphthalenesulfonate and formalin, an ethylene oxide addition product and a non-ionic anionic surfactant is added thereto.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the 12CaO. 7Al2O3 has an amorphous form.
References Cited (Backward Citations)
US3155526A
Cited
US3359225A
Cited
US3251701A
Cited
US3510326A
Cited
US3303037A
Cited
US3666515A
Cited
US3677780A
Cited
US3663287A
Cited
US3628973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |