Patent US4057526A successfully refreshed from Google Patents.
US4057526A
Expired / Lapsed
US
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Process for preparing frost resistant concrete
Assignee: Akzo NV
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Filing: 1976-05-06
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Granted: 1977-11-08
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Expires: 1996-05-06
Abstract
Abstract A process is provided for making frost resistant cement products having improved 28 day compressive strengths wherein a gas is included in the product by substantially uniformly dispersing hollow gas filled synthetic polymeric spheres in the cement mixture prior to setting thereof. The invention also provides a frost resistant cement product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 mu m substantially uniformly dispersed therein.
Inventors
- 👤 Poppe de Rook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:44
CPC Classifications
C; C04; C04B; C04B16/00; C04B16/04; C04B16/08; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
In a process for the preparation of a frost resistant concrete, in which process a volume percentage of gas in a finely divided form is incorporated in a fresh concrete mixture which is subsequently allowed to cure, the improvement which comprises adding the gas to the mixture while it is entrapped in spheres of a synthetic polymer which is inert under the curing conditions, the dimensions of the spheres being in the range of about 10 to 100 μm and the amount in which they are added in the range of 0.01 to 0.1% by weight, calculated on the dry cement weight.
Claim 2
Dependent Claim
102 words
In a process for the preparation of a frost resistant concrete, in which process a volume percentage of gas in a finely divided form is incorporated in a fresh concrete mixture which is subsequently allowed to cure, the improvement which comprises adding the gas to the mixture while it is entrapped in spheres of a synthetic polymer which is inert under the curing conditions, the dimensions of the spheres being in the range of about 10 to 100 μm and the amount in which they are added in the range of 0.01 to 0.1% by weight, calculated on the dry cement weight.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the spheres are polyethylene, polypropylene, polymethyl methacrylate, poly-o-chlorostyrene, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polystyrene or copolymers thereof.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the spheres are a copolymer of vinylidene chloride and acrylonitrile.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the spheres are a copolymer of vinyl chloride and vinylidene chloride.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the spheres have an average particle size within the range of from 10 to 60 μm.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein the average particle size of the spheres is about 40 μm.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein the spheres are incorporated in the concrete mixture in an amount of about 0.015 to 0.035% by weight, calculated on the dry cement weight.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the spheres are incorporated in the concrete mixture while it is in the form of a wet composition.
Claim 10
Dependent Claim
28 words
The process of claim 8 wherein the wet composition contains about 8% by weight of spheres, 13% by weight of sodium gluconate and 79% by weight of water.
Claim 11
Dependent Claim
14 words
Concrete structures made of a concrete prepared by a process according to claim 1.
Claim 12
Dependent Claim
44 words
A frost resistant cement based product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 μm substantially uniformly dispersed therein.
Claim 13
Dependent Claim
44 words
A frost resistant cement based product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 μm substantially uniformly dispersed therein.
Claim 14
Dependent Claim
67 words
A process for improving the frost resistance of a cement based product which comprises mixing with a cement mix prior to setting from about 0.01% to about 0.1% by weight calculated on the weight of dry cement of spheres of a synthetic polymer containing an inert gas, said spheres having a cross-section of from about 10 to about 100 μm and being inert to the cement product.
Claim 15
Dependent Claim
67 words
A process for improving the frost resistance of a cement based product which comprises mixing with a cement mix prior to setting from about 0.01% to about 0.1% by weight calculated on the weight of dry cement of spheres of a synthetic polymer containing an inert gas, said spheres having a cross-section of from about 10 to about 100 μm and being inert to the cement product.
References Cited (Backward Citations)
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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 |