US4082562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous particles in frost-resistant cementitious materials
Assignee: National Research Council Canada
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Filing: 1976-11-15
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Granted: 1978-04-04
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Expires: 1996-11-15
Abstract
Abstract A method of producing freeze-thaw resistant cementitious porous materials, such as concrete, mortar, stucco, in which up to about 30% by weight of the cement of a porous particulate material is mixed into the material. The particulate material may be finely divided fired clay, brick, diatomaceous earth or other mineral particles having a size range of 20-50 Tyler mesh, a total porosity of at least 30% and a pore size in the range 0.05 to 3.0 microns.
Inventors
- 👤 Gerhard G. Litvan
- 👤 Peter J. Sereda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:48
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
A method of producing frost-resistant concrete and other cementitious materials comprising: (a) selecting a particulate porous material having a selected particle size in the range between 290 and 850 microns, a total porosity of at least 30% and a selected pore size distribution in the range of 0.05 to 3 microns; and (b) mixing said particulate porous material into said cementitious material in an effective amount up to 30% by weight of cement so as to produce a frost-resistant material which will withstand at least 300 freeze-thaw cycles as measured by the method of ASTM C-666 without significant change in length or modulus.
Claim 2
Independent Claim
103 words
A method of producing frost-resistant concrete and other cementitious materials comprising: (a) selecting a particulate porous material having a selected particle size in the range between 290 and 850 microns, a total porosity of at least 30% and a selected pore size distribution in the range of 0.05 to 3 microns; and (b) mixing said particulate porous material into said cementitious material in an effective amount up to 30% by weight of cement so as to produce a frost-resistant material which will withstand at least 300 freeze-thaw cycles as measured by the method of ASTM C-666 without significant change in length or modulus.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 wherein said particulate porous material is selected from the group consisting of diatomaceous earth, and fired clay particles.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1 wherein the pore size is selected to be in the range 0.1 to 1.0 microns.
Claim 5
Dependent Claim
37 words
A method as claimed in claim 2 wherein diatomaceous earth is added in an amount between 2-5% by weight of cement and is selected to have a particle size in the range about 420 to 590 microns.
Claim 6
Dependent Claim
39 words
A method as claimed in claim 2 wherein fired clay particles are added in an amount between 12-20% by weight of cement and are selected to have a pore size distribution centered in the range 0.5 to 1.1 microns.
Claim 7
Dependent Claim
73 words
A frost-resistant cementitious material which will withstand at least 300 freeze-thaw cycles as measured by the method of ASTM C-666 and which includes an effective amount, up to about 30% by weight of cement, of a particulate porous material having a selected particle size in the range between 290 and 850 microns, a total porosity of at least 30% and a selected pore size distribution in the range of 0.05 to 3 microns.
Claim 8
Dependent Claim
73 words
A frost-resistant cementitious material which will withstand at least 300 freeze-thaw cycles as measured by the method of ASTM C-666 and which includes an effective amount, up to about 30% by weight of cement, of a particulate porous material having a selected particle size in the range between 290 and 850 microns, a total porosity of at least 30% and a selected pore size distribution in the range of 0.05 to 3 microns.
Claim 9
Dependent Claim
26 words
A cementitious material as claimed in claim 6 wherein said particulate porous material is selected from the group consisting of diatomaceous earth, and fired clay particles.
Claim 10
Dependent Claim
23 words
A cementitious material as claimed in claim 6 wherein the pore size is selected to be in the range 0.1 to 1.0 microns.
Claim 11
Dependent Claim
40 words
A cementitious material as claimed in claim 7 wherein diatomaceous earth is present in an amount between 2 and 5% by weight of cement and is selected to have a particle size in the range about 420 to 590 microns.
Claim 12
Dependent Claim
42 words
A cementitious material as claimed in claim 7 wherein fired clay particles are present in an amount between 12 and 20% by weight of cement and are selected to have a pore size distribution centered in the range 0.5 to 1.1 microns.
Claim 13
Dependent Claim
16 words
A cementitious material as claimed in claim 10 wherein said fired clay particles are ground brick.
Claim 14
Dependent Claim
45 words
A cementitious material as claimed in claim 6 produced from a mixture comprising about 1 part by weight cement, about 0.58 part by weight water, about 2.25 parts by weight sand, about 2.75 parts by weight aggregate and about 0.022 parts by weight diatomaceous earth.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |