US3619221A
Expired / Lapsed
US
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Amine formate accelerator additives for portland cement compositions
Assignee: WR Grace and Co
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Filing: 1970-03-25
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Granted: 1971-11-09
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Expires: 1990-03-25
Abstract
Abstract Water-soluble salts of amines and formic acid are added to Portland cement compositions (e.g. concrete) to accelerate the setting time thereof. The additives exhibit a particular effectiveness for offsetting the set-retardation effect of waterreducing, set-retarding agents, (e.g. lignosulfonates) employed in Portland cement compositions.
Inventors
- 👤 Theophilos G Kossivas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:40
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B24/00; C04B24/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
15 words
The composition of claim 1 wherein the amine contains up to about 20 carbon atoms.
Claim 2
Dependent Claim
14 words
The composition of claim 1 wherein said amine is a substantially nonhydroxyl containing amine.
Claim 3
Dependent Claim
44 words
A settable Portland cement mix consisting essentially of Portland cemenT, aggregate, water and a water-soluble amine formate salt formed by the reaction of an amine and formic acid, said salt being present in an amount sufficient to accelerate the setting time of said mix.
Claim 4
Dependent Claim
77 words
A settable Portland cement composition consisting essentially of Portland cement, water, about 0.01 to 10 weight percent of a water-soluble amine formate salt formed by the reaction of an amine and formic acid, and about 0.01 to 10 weight percent of a water-soluble, water-reducing, set-retarding agent for said composition, said amounts being based upon the weight of the cement and the amount of said formate being sufficient to offset the set-retardation effect of said water-reducing, set-retarding agent.
Claim 5
Dependent Claim
31 words
The composition of claim 5 wherein said amine contains up to about 20 carbon atoms and is selected from the group consisting of aliphatic amines, heterocyclic N-containing amines and mixtures thereof.
Claim 6
Dependent Claim
36 words
The composition of claim 5 wherein said water-reducing, set-retarding agent is selected from the group consisting of carbohydrates, polyhydroxy polycarboxylic acids, lignosulfonic acid and salts thereof, salts of boric acid, silicones, and mixtures of the foregoing.
Claim 7
Dependent Claim
36 words
The composition of claim 5 wherein the amount of said salt ranges between about 0.1 and 2 weight percent and the amount of said water-reducing agent, set-retarding agent ranges between about 0.1 and 3 weight percent.
Claim 8
Dependent Claim
85 words
An additive composition for settable Portland cement compositions, said additive composition consisting essentially of from about 10 to 90 weight percent of a water-soluble amine formate salt formed by the reaction of an amine and formic acid, and about 10 to 90 weight percent of a water-soluble, water reducing, set-retarding agent for said Portland cement composition, said amounts being based upon the weight of the additive composition and the amount of said formate being sufficient to offset the set-retardation effect of said water-reducing, set-retarding agent.
Claim 9
Dependent Claim
15 words
The composition of claim 9 wherein said amine contains up to about 20 carbon atoms.
Claim 10
Dependent Claim
27 words
The composition of claim 9 wherein said agent is selected from the group consisting of corn syrup, lignosulfonic acid and salts thereof, glucose, sucrose, and mixtures thereof.
Claim 11
Dependent Claim
108 words
A settable Portland cement composition consisting essentially of Portland cement, water, aggregate, from about 0.1 to 2 percent by weight of a water-soluble amine formate salt formed by the reaction of an amine containing up to about 20 carbon atoms and formic acid, and from about 0.1 to 3 weight percent of a water-soluble, water-reducing, set-retarding agent selected from the group consisting of carbohydrates, polyhydroxy polycarboxylic acids, lignosulfonic acid and salts thereof, salts of boric acid, silicones, and mixtures thereof, said amounts being based upon the weight of the cement and the amount of said formate being sufficient to offset the set-retardation effect of said water-reducing, set-retarding agent.
Claim 12
Dependent Claim
121 words
An additive composition for incorporation in settable Portland cement compositions, said additive composition consisting essentially of from about 10 to 90 weight percent of a water-soluble amine formate salt formed by the reaction of a substantially nonhydroxyl containing amine containing up to about 20 carbon atoms and formic acid, and about 10 to 90 weight percent of a water-soluble, water-reducing, set-accelerating agent for said Portland cement composition selected from the group consisting of carbohydrates, polyhydroxy polycarboxylic acids, lignosulfonic acid and salts thereof, salts of boric acid, silicones, and mixtures thereof, said amounts being based upon the total weight of said additive composition and the amount of said formate being sufficient to offset the set-retardation effect of said water-reducing, set-retarding retarding agent.
Claim 13
Dependent Claim
18 words
The addiTive composition of claim 13 wherein said amine comprises a mixture of aliphatic and heterocyclic N-containing amines.
Claim 14
Dependent Claim
11 words
THe additive composition of claim 13 wherein said amine is triethylamine.
Claim 15
Dependent Claim
11 words
The additive composition of claim 13 wherein said amine is cyclohexylamine.
Claim 16
Dependent Claim
15 words
The additive composition of claim 13 wherein said amine comprises a mixture of polyethylene amines.
Claim 17
Dependent Claim
12 words
The additive composition of claim 13 wherein said agent is corn syrup.
Claim 18
Dependent Claim
15 words
The additive composition of claim 13 wherein said agent is a salt of lignosulfonic acid.
Claim 19
Dependent Claim
16 words
The additive composition of claim 13 wherein said agent is a mixture of glucose and sucrose.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |