US4404031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hydraulic cements
Assignee: Taiheiyo Cement Corp
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Filing: 1982-01-04
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Granted: 1983-09-13
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Expires: 2002-01-04
Abstract
Abstract A calcium sulfoaluminate clinker having a calcium sulfoaluminate compound 3CaO.3Al 2 O 3 . CaSO 4 as a main component, a Portland cement and a blast furnace granulated slag are mixed to produce cements which prevent the formation of efflorescence.
Inventors
- 👤 Giichi Sudoh
- 👤 Keiichi Minegishi
- 👤 Kanjiro Ishizaki
- 👤 Ikuo Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:21
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
A process for producing hydraulic cements characterized by mixing a first raw material which is 3 to 20% by weight of a clinker or cement having as a main component a calcium sulfoaluminate compound or calcium aluminate compound having a mol ratio of CaO/Al 2 O 3 less than 3 as 3CaO.3Al 2 O 3 .CaSO 4 , CaO.Al 2 O 3 or 12CaO.7Al 2 O 3 when expressed as a calcium sulfoaluminate compound or calcium aluminate compound, a second raw material which is 3 to 20% by weight of a clinker or cement having as a main component a tricalcium silicate 3CaO.SiO 2 or dicalcium silicate 2CaO.SiO 2 as a Portland cement or mixed cement when expressed as a calcium silicate compound, a third raw material which is 6 to 40% by weight of a gypsum as gypsum anhydride or gypsum dihydrate when expressed as CaSO 4 , a fourth raw material which is 20 to 88% by weight of a blast furnace granulated slag and a fifth raw material which is 0.1 to 1.5% by weight of an oxycarboxylic acid or sodium salt thereof which is sodium citrate, malic acid, tartaric acid or sodium tartarate so that a mol ratio of (3Al 2 O 3 +1.5SiO 2 )/(CaO--SO 3 ) may not be less than 1.
Claim 2
Dependent Claim
218 words
A process for producing hydraulic cements characterized by mixing a first raw material which is 3 to 20% by weight of a clinker or cement having as a main component a calcium sulfoaluminate compound or calcium aluminate compound having a mol ratio of CaO/Al 2 O 3 less than 3 as 3CaO.3Al 2 O 3 .CaSO 4 , CaO.Al 2 O 3 or 12CaO.7Al 2 O 3 when expressed as a calcium sulfoaluminate compound or calcium aluminate compound, a second raw material which is 3 to 20% by weight of a clinker or cement having as a main component a tricalcium silicate 3CaO.SiO 2 or dicalcium silicate 2CaO.SiO 2 as a Portland cement or mixed cement when expressed as a calcium silicate compound, a third raw material which is 6 to 40% by weight of a gypsum as gypsum anhydride or gypsum dihydrate when expressed as CaSO 4 , a fourth raw material which is 20 to 88% by weight of a blast furnace granulated slag and a fifth raw material which is 0.1 to 1.5% by weight of an oxycarboxylic acid or sodium salt thereof which is sodium citrate, malic acid, tartaric acid or sodium tartarate so that a mol ratio of (3Al 2 O 3 +1.5SiO 2 )/(CaO--SO 3 ) may not be less than 1.
Claim 3
Dependent Claim
214 words
A hydraulic cement composition comprising a first raw material which is 3 to 20% by weight of a clinker or cement having as a main component a calcium sulfoaluminate compound or calcium aluminate compound having a mol ratio of CaO/Al 2 O 3 less than 3 as 3CaO.3Al 2 O 3 .CaSO 4 , CaO.Al 2 O 3 or 12CaO.7Al 2 O 3 when expressed as a calcium sulfoaluminate compound or calcium aluminate compound, a second raw material which is 3 to 20% by weight of a clinker or cement having as a main component a tricalcium silicate 3CaO.Si0 2 or dicalcium silicate 2CaO.SiO 2 as a Portland cement or mixed cement when expressed as a calcium silicate compound, a third raw material which is 6 to 40% by weight of a gypsum as gypsum anhydride or gypsum dihydrate when expressed as CaSO 4 , a fourth raw material which is 20 to 88% by weight of a blast furnace granulated slag and a fifth raw material which is 0.1 to 1.5% by weight of an oxycarboxylic acid or sodium salt thereof which is sodium citrate, malic acid, tartaric acid or sodium tartarate so that a mol ratio of (3Al 2 O 3 +1.5SiO 2 )/(CaO--SO 3 ) may not be less than 1.
Claim 4
Dependent Claim
214 words
A hydraulic cement composition comprising a first raw material which is 3 to 20% by weight of a clinker or cement having as a main component a calcium sulfoaluminate compound or calcium aluminate compound having a mol ratio of CaO/Al 2 O 3 less than 3 as 3CaO.3Al 2 O 3 .CaSO 4 , CaO.Al 2 O 3 or 12CaO.7Al 2 O 3 when expressed as a calcium sulfoaluminate compound or calcium aluminate compound, a second raw material which is 3 to 20% by weight of a clinker or cement having as a main component a tricalcium silicate 3CaO.Si0 2 or dicalcium silicate 2CaO.SiO 2 as a Portland cement or mixed cement when expressed as a calcium silicate compound, a third raw material which is 6 to 40% by weight of a gypsum as gypsum anhydride or gypsum dihydrate when expressed as CaSO 4 , a fourth raw material which is 20 to 88% by weight of a blast furnace granulated slag and a fifth raw material which is 0.1 to 1.5% by weight of an oxycarboxylic acid or sodium salt thereof which is sodium citrate, malic acid, tartaric acid or sodium tartarate so that a mol ratio of (3Al 2 O 3 +1.5SiO 2 )/(CaO--SO 3 ) may not be less than 1.
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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |