US4026716A
Expired / Lapsed
US
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Concrete composition
Assignee: Martin Marietta Magnesia Specialties LLC
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Filing: 1976-06-28
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Granted: 1977-05-31
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Expires: 1996-06-28
Abstract
Abstract A high compressive strength concrete is disclosed. The concrete is formed by mixing with water a general-use cement, dolomitic limestone as a low-silica manufactured fine aggregate, and from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, and curing the mixture.
Inventors
- 👤 George C. Urschel III
- 👤 George G. Judd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:37
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B18/00; C04B18/04; C04B18/16; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A cementitious structural composition consisting essentially of Portland cement, dolomitic limestone as a low-silica manufactured fine aggregate, water and from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle size essentially less than 5 microns.
Claim 2
Dependent Claim
59 words
A cementitious structural composition consisting essentially of Portland cement, dolomitic limestone as a low-silica manufactured fine aggregate, water and from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle size essentially less than 5 microns.
Claim 3
Dependent Claim
13 words
A composition as claimed in claim 1 additionally containing a coarse limestone aggregate.
Claim 4
Dependent Claim
36 words
A composition as claimed in claim 1 wherein the precipitate contains from about 34.4 to 38.1 percent by weight calcium, calculated as CaO and from about 25.4 to 36.1 percent by weight magnesium, calculated as MgO.
Claim 5
Dependent Claim
36 words
A composition as claimed in claim 2 wherein the precipitate has a calcium content calculated as CaO of about 35 percent by weight and a magnesium content calculated as MgO of about 26 percent by weight.
Claim 6
Dependent Claim
89 words
A cementitious structural composition consisting of from 11 to 14 percent by weight Portland cement, from about 33.8 to 38.1 percent by weight of dolomitic limestone as a low-silica manufactured fine aggregate, about 46 percent by weight coarse limestone aggregate, from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle sizing of essentially less than 5 microns and sufficient water to form a workable mixture.
Claim 7
Dependent Claim
89 words
A cementitious structural composition consisting of from 11 to 14 percent by weight Portland cement, from about 33.8 to 38.1 percent by weight of dolomitic limestone as a low-silica manufactured fine aggregate, about 46 percent by weight coarse limestone aggregate, from about 5 to 15 percent by weight, based on the manufactured fine aggregate, of a precipitate comprising CaO-MgO from the gaseous effluent from a kiln burning dolomitic limestone, said precipitate having a particle sizing of essentially less than 5 microns and sufficient water to form a workable mixture.
Claim 8
Dependent Claim
31 words
A composition as claimed in claim 1 wherein the manufactured fine aggregate contains 30 percent by weight calcium, calculated as CaO and about 22 percent by weight magnesium, calculated as MgO.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |