Patent US4057528A successfully refreshed from Google Patents.
US4057528A
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Process for repairing concrete structures using pneumatically sprayable cement mortar compositions containing portland cement, mineral aggregate, a styrene-butadiene copolymer latex and water
Assignee: Dow Chemical Co
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Filing: 1976-04-19
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Granted: 1977-11-08
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Expires: 1996-04-19
Abstract
Abstract Process for repairing concrete compositions using cement mortar compositions which are capable of being pneumatically sprayed and which provide unexpectedly enhanced bonding capabilities and resistance to slump; said compositions comprising essentially a substantially non-air entraining portland cement, mineral aggregate, a styrene-butadiene copolymer latex present on a solids basis in an amount of from about 5 to about 25 percent by weight of cement, and water in an amount sufficient to provide a total water to cement ratio of from 0.22 to 0.26.
Inventors
- 👤 David A. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:49
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
In the process of repairing concrete structures by applying a cement mortar thereto the improvement consisting of pneumatically applying to the concrete structure to be repaired, a mixture of a substantially non-air entraining portland cement, mineral aggregate, a styrene-butadiene copolymer latex having a styrene to butadiene weight ratio of from about 30:70 to about 70:30, said copolymer being present on a solids basis in an amount of from about 5 to about 25 percent by weight of cement, and from about 0.1 to 5 percent of a polyorganosiloxane foam depressant based on the weight of active polyorganosiloxane, while maintaining the ratio of total water to cement in such mixture at a value of from 0.22 to 0.26.
Claim 2
Dependent Claim
117 words
In the process of repairing concrete structures by applying a cement mortar thereto the improvement consisting of pneumatically applying to the concrete structure to be repaired, a mixture of a substantially non-air entraining portland cement, mineral aggregate, a styrene-butadiene copolymer latex having a styrene to butadiene weight ratio of from about 30:70 to about 70:30, said copolymer being present on a solids basis in an amount of from about 5 to about 25 percent by weight of cement, and from about 0.1 to 5 percent of a polyorganosiloxane foam depressant based on the weight of active polyorganosiloxane, while maintaining the ratio of total water to cement in such mixture at a value of from 0.22 to 0.26.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said polyorganosiloxane is a condensation product of dimethyl silane diol.
Claim 4
Dependent Claim
93 words
The process of claim 2 wherein said latex contains, based on the weight of said copolymer, (a) from about 2 to about 10 percent of non-ionic surfactant, (b) from about 0.75 to 7.5 percent of anionic surfactant, at least about 15 percent of which is a sodium alkyl sulfate in which the alkyl group contains 9 to 17 carbon atoms, the sum of (a) and (b) not exceeding about 11 percent by weight of said copolymer and the weight ratio of (a) to (b) being within the range of about 0.7:1 to 10:1.
Claim 5
Dependent Claim
29 words
The process of claim 3 wherein said non-ionic surfactant is a di-alkylphenoxynonaoxyethylene-ethanol and the anionic surfactant comprises a mixture of an alkyl aryl sulfonate and a sodium alkyl sulfate.
Claim 6
Dependent Claim
23 words
The process of claim 4 wherein said alkyl aryl sulfonate is dodecylbenzene sodium sulfonate and said sodium alkyl sulfate is sodium lauryl sulfate.
Claim 7
Dependent Claim
25 words
The process of claim 5 wherein said copolymer is a copolymer of about 66 percent by weight styrene and about 34 percent by weight butadiene.
Claim 8
Dependent Claim
20 words
The process of claim 6 wherein said copolymer has an average particle size of from about 1900A to about 2500A.
Claim 9
Dependent Claim
19 words
The process of claim 7 wherein said copolymer latex has a pH of from about 9.5 to about 11.
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) | 1980-11-07 | 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 |