Patent US4014840A successfully refreshed from Google Patents.
US4014840A
Expired / Lapsed
US
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Non-distressing accelerated heat cure of portland cement concrete systems
Assignee: Dow Chemical Co
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Filing: 1974-06-12
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Granted: 1977-03-29
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Expires: 1994-06-12
Abstract
Abstract A process for accomplishing a non-distressing accelerated heat cure of portland cement concrete systems comprising (1) admixing portland cement concrete with minor amounts of a vinylidene chloride polymer latex, than (2) heating the admixture to temperatures of from at least about 100° F to about 250° F under less than about 80 percent relative humidity for a period of at least about 4 hours. This process is particularly applicable for the preparation of portland cement concrete precasting and prestressing operations, where optimum strength is desired in the shortest possible time.
Inventors
- 👤 Gale L. Emig
- 👤 Robert H. Anspaugh
- 👤 R. Douglas Eash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:00
CPC Classifications
C; C04; C04B; C04B40/00; C04B40/02; C04B40/0263; C04B24/00; C04B24/24; C04B24/26; C04B24/2682
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
A process for non-distressing accelerated heat cure of portland cement concrete systems said process consisting of the sequential steps of (1) admixing portland cement concrete with a vinylidene chloride polymer latex said latex being present in an amount sufficient to provide from about 5 to about 20 percent by weight of latex solids based on the weight of portland cement in said portland cement concrete and wherein said vinylidene chloride polymer is composed of about 75 parts by weight of vinylidene chloride, about 5 parts by weight of ethyl acrylate, about 2 parts by weight of methyl methacrylate and about 20 parts by weight of vinyl chloride, then (2) heating said admixture to temperatures of from at least about 100° F to about 250° F under less than about 80 percent relative humidity for a period of at least about 4 hours.
Claim 2
Dependent Claim
142 words
A process for non-distressing accelerated heat cure of portland cement concrete systems said process consisting of the sequential steps of (1) admixing portland cement concrete with a vinylidene chloride polymer latex said latex being present in an amount sufficient to provide from about 5 to about 20 percent by weight of latex solids based on the weight of portland cement in said portland cement concrete and wherein said vinylidene chloride polymer is composed of about 75 parts by weight of vinylidene chloride, about 5 parts by weight of ethyl acrylate, about 2 parts by weight of methyl methacrylate and about 20 parts by weight of vinyl chloride, then (2) heating said admixture to temperatures of from at least about 100° F to about 250° F under less than about 80 percent relative humidity for a period of at least about 4 hours.
Claim 3
Dependent Claim
14 words
A cured, substantially crack-free portland cement concrete prepared by the process of claim 1.
References Cited (Backward Citations)
US2819239A
Cited
US3297613A
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US3325435A
Cited
US3250736A
Cited
US3819565A
Cited
US3784648A
Cited
US3773700A
Cited
US3879909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |