US4431310A
Expired / Lapsed
US
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Method of preparing kneaded compositions
Assignee: Taisei Corp
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Filing: 1981-11-30
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Granted: 1984-02-14
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Expires: 2001-11-30
Abstract
Abstract In the preparation of a cement paste about 30 to 76% of the total water is added to the cement to form a funicular state, capillary state or slurry state, and the resulting mixture is kneaded so as to reduce the coagulated lumps of cement. Then the remaining quantity of water is added and the composition or mixture is kneaded again. Sand and/or gravel may be incorporated after the firstly kneaded mixture. The resulting cement paste, mortar or green concrete exhibits a small percentage of bleeding water and products prepared therefrom have a high compression strength.
Inventors
- 👤 Yasuro Ito
- 👤 Yoshiro Higuchi
- 👤 Masanori Tsuji
- 👤 Hideharu Kaga
- 👤 Yasuhiro Yamamoto
- 👤 Kenji Kuroha
- 👤 Norio Marushima
- 👤 Mitsutaka Hayakawa
- 👤 Eiichi Tazawa
- 👤 Yasunori Matsuoka
- 👤 Seiji Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:22
CPC Classifications
C; C04; C04B; C04B40/00; C04B40/0028; B; B28; B28C; B28C5/00; B28C5/003
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A method of preparing a kneaded compositon comprising the steps of: incorporating a primary water to a powder of a hydraulic substance such as cement in a quantity sufficient to form a funicular state, capillary state or slurry condition close to the capillary state; subjecting the resulting mixture to a first kneading operation so as to decrease coagulated lumps of said powder; adding a secondary water to said kneaded mixture in a quantity necessary to form a predetermined water to cement ratio of said composition; and subjecting the resulting mixture to a second kneading operation; said quantity of primary water being selected to correspond to said predetermined water to cement ratio of said composition and the quantity of said secondary water being selected to correspond to a forecasted quantity of bleeding water.
Claim 2
Independent Claim
132 words
A method of preparing a kneaded compositon comprising the steps of: incorporating a primary water to a powder of a hydraulic substance such as cement in a quantity sufficient to form a funicular state, capillary state or slurry condition close to the capillary state; subjecting the resulting mixture to a first kneading operation so as to decrease coagulated lumps of said powder; adding a secondary water to said kneaded mixture in a quantity necessary to form a predetermined water to cement ratio of said composition; and subjecting the resulting mixture to a second kneading operation; said quantity of primary water being selected to correspond to said predetermined water to cement ratio of said composition and the quantity of said secondary water being selected to correspond to a forecasted quantity of bleeding water.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein the quantity of said primary water incorporated into said hydraulic substance powder amounts to 15-38% based on the weight of said powder.
Claim 4
Dependent Claim
29 words
The method according to claim 1, wherein the quantity of said primary water amounts to 30-76% by weight of the total quantity of water necessary for preparing said compositions.
Claim 5
Dependent Claim
30 words
The method according to claim 1, wherein said secondary water is incorporated over a time of more than 10% of a period in which said secondary kneading operation is performed.
Claim 6
Dependent Claim
19 words
The method according to claim 1, wherein a dehydration agent is added during said first or second kneading operation.
Claim 7
Independent Claim
124 words
A method of preparing a kneaded composition comprising the steps of: incorporating a primary water to a powder of a hydraulic substance such as cement in a quantity sufficient to form a funicular state, capillary state or slurry state close to the capillary state; subjecting the resulting mixture to a first kneading operation so as to decrease coagulated lumps of said powder; incorporating a fine aggregate having water adhered thereto; adding a secondary water to said kneaded mixture in a quantity necessary to form a predetermined water to cement ratio of said composition; and subjecting the resulting mixture to a second kneading operation; the quantity of said secondary water being determined by taking into consideration the quantity of water adhered to said fine aggregate.
Claim 8
Independent Claim
124 words
A method of preparing a kneaded composition comprising the steps of: incorporating a primary water to a powder of a hydraulic substance such as cement in a quantity sufficient to form a funicular state, capillary state or slurry state close to the capillary state; subjecting the resulting mixture to a first kneading operation so as to decrease coagulated lumps of said powder; incorporating a fine aggregate having water adhered thereto; adding a secondary water to said kneaded mixture in a quantity necessary to form a predetermined water to cement ratio of said composition; and subjecting the resulting mixture to a second kneading operation; the quantity of said secondary water being determined by taking into consideration the quantity of water adhered to said fine aggregate.
Claim 9
Dependent Claim
26 words
The method according to claim 6, wherein said fine aggregate is incorporated together with said primary water to said powder, prior to the first kneading operation.
Claim 10
Dependent Claim
36 words
The method according to claim 6, wherein the addition of said fine aggregate is followed by an intermediate kneading which, in turn, is followed by the addition of said secondary water to the resulting kneaded mixture.
Claim 11
Dependent Claim
23 words
The method according to claim 6, wherein said fine aggregate is incorporated together with said secondary water, followed by said second kneading operation.
Claim 12
Dependent Claim
29 words
The method according to claim 6, wherein the quantity of said primary water amounts to 30-76% by weight of the total quantity of water necessary for preparing said composition.
Claim 13
Dependent Claim
30 words
The method according to claim 6, wherein said secondary water is incorporated over a time of more than 10% of a period in which said secondary kneading operation is performed.
Claim 14
Dependent Claim
19 words
The method according to claim 6, wherein a dehydration agent is added during said first or second kneading operation.
Claim 15
Dependent Claim
22 words
The method according to claim 6, wherein said fine aggregate is pretreated so that a predetermined quantity of water is adhered thereto.
Claim 16
Dependent Claim
12 words
The method according to claim 13 wherein said fine aggregate comprises sand.
Claim 17
Dependent Claim
17 words
The method according to claim 6, wherein a coarse aggregate is added together with said fine aggregate.
Claim 18
Dependent Claim
26 words
The method according to claim 15 wherein after incorporation of said fine and coarse aggregates, the resulting mixture is kneaded and then secondary water is added.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |