US3895953A
Expired / Lapsed
US
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Admixtures for reducing slump loss in hydraulic cement concretes
Assignee: University of California Berkeley
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Filing: 1974-01-11
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Granted: 1975-07-22
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Expires: 1994-01-11
Abstract
Abstract In freshly mixed portland cement concrete, slump loss, which normally occurs during transportation and handling, can be either prevented or considerably reduced by admixing small amounts of styrene-butadiene latices, e.g., 0.01 to 0.15% of latex (on solid basis) by weight of concrete or 0.1 to 1.5% of latex by weight of cement. Thus, by maintaining plasticity of fresh (unhardened) concrete for prolonged periods of time, the small amount of latex admixture can permit transportation of pre-mixed concrete over longer hauling distances, or permit longer handling time for placement, consolidation, and finishing of concrete in formwork.
Inventors
- 👤 Povindar K Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:26
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2676
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A COMPOSITION FOR REDUCING EARLY SLUMP LOSS IN HYDRAULIC CEMENT CONCRETES COMPRISING MIXTURE OF AN HYDRAULIC CEMENT, SAND, GRAVEL, WATER AND A STYRENE-BUTADIENE LATEX PRESENT, ON A SOLIDS BASIS, IN AN AMOUNT OF FROM ABOUT 0.1 TO ABOUT 1.5% BY WEIGHT OF THE CEMENT.
Claim 2
Dependent Claim
44 words
A COMPOSITION FOR REDUCING EARLY SLUMP LOSS IN HYDRAULIC CEMENT CONCRETES COMPRISING MIXTURE OF AN HYDRAULIC CEMENT, SAND, GRAVEL, WATER AND A STYRENE-BUTADIENE LATEX PRESENT, ON A SOLIDS BASIS, IN AN AMOUNT OF FROM ABOUT 0.1 TO ABOUT 1.5% BY WEIGHT OF THE CEMENT.
Claim 3
Dependent Claim
29 words
An hydraulic cement concrete mixture having reduced early slump loss including therein about 0.1 to about 1.5% by weight styrene-butadiene latex, on a solids basis, by weight of cement.
Claim 4
Dependent Claim
29 words
An hydraulic cement concrete mixture having reduced early slump loss including therein about 0.1 to about 1.5% by weight styrene-butadiene latex, on a solids basis, by weight of cement.
Claim 5
Dependent Claim
59 words
An hydraulic cement concrete mixture having reduced early slump loss at temperatures above 85*F including therein styrene-butadiene latex present, on a solids basis, in an amount from about 0.1 to about 1.5% by weight of the hydraulic cement, and a set retarder selected from the group consisting of citric acid and salts thereof, zinc oxide, ethylene glycol and glycerine.
Claim 6
Dependent Claim
59 words
An hydraulic cement concrete mixture having reduced early slump loss at temperatures above 85*F including therein styrene-butadiene latex present, on a solids basis, in an amount from about 0.1 to about 1.5% by weight of the hydraulic cement, and a set retarder selected from the group consisting of citric acid and salts thereof, zinc oxide, ethylene glycol and glycerine.
Claim 7
Independent Claim
35 words
A method for reducing early slump loss in hydraulic cement concretes comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of cement, into the concrete during the mixing thereof.
Claim 8
Independent Claim
35 words
A method for reducing early slump loss in hydraulic cement concretes comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of cement, into the concrete during the mixing thereof.
Claim 9
Independent Claim
55 words
A method for reducing early slump loss in hydraulic cement concretes when mixed at temperatures greater than 85*F comprising admixing into the concrete styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of the hydraulic cement in said concrete, and further admixing into the concrete (in combination with) a set retarder.
Claim 10
Independent Claim
55 words
A method for reducing early slump loss in hydraulic cement concretes when mixed at temperatures greater than 85*F comprising admixing into the concrete styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight of the hydraulic cement in said concrete, and further admixing into the concrete (in combination with) a set retarder.
Claim 11
Dependent Claim
27 words
The method of claim 5, wherein the set retarder is selected from the group consisting of citric acid and salts thereof, zinc oxide, ethylene glycol and glycerine.
Claim 12
Independent Claim
46 words
A method of obtaining air entrained concrete having reduced slump loss tendencies, comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight relative to cement in said concrete, with concrete components of cement, sand, gravel and water during the mixing thereof.
Claim 13
Independent Claim
46 words
A method of obtaining air entrained concrete having reduced slump loss tendencies, comprising admixing styrene-butadiene latex in amounts of from about 0.1 to about 1.5% by weight relative to cement in said concrete, with concrete components of cement, sand, gravel and water during the mixing thereof.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |