US4357166A
Expired / Lapsed
US
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Method and composition for controlling volume change in fast setting, fluid impermeable cementitious systems
Assignee: Construction Products Research Inc
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Filing: 1981-05-11
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Granted: 1982-11-02
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Expires: 2001-05-11
Abstract
Abstract A cementitious composition which, when mixed with water, is capable of setting rapidly into a hard mass of high compressive strength without substantial shrinkage during setting, and having reduced wet and dry volume changes in the hardened state comprises aluminous cement, gypsum, a drying shrinkage inhibitor and a wet expansion inhibitor. The wet expansion inhibitor is a lithium salt which may be added in an effective amount ranging between 0.01 to 0.5 percent, by weight, based on the aluminous cement and gypsum and preferably between 0.1 and 0.3 percent. It is preferred to employ between 60 and 90 percent, by weight, aluminous cement and between 10 and 40 percent, by weight, gypsum. The hardened drying shrinkage inhibitor, preferably Portland cement, is added in an amount ranging between 0.1 and 25 percent, by weight, based on the aluminous cement and gypsum, and preferably between 1 and 20 percent.
Inventors
- 👤 Warner K. Babcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:29
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065; C04B22/00; C04B22/06; C04B22/062; C04B22/08; C04B22/10; C04B24/00; C04B24/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
48 words
A cementitious composition which, when mixed with water, is capable of setting into a hard mass with inhibited wet expansion in the hardened state comprising aluminous cement, gypsum, a drying shrinkage inhibitor and a salt of lithium in an amount effective to act as a wet expansion inhibitor.
Claim 2
Dependent Claim
48 words
A cementitious composition which, when mixed with water, is capable of setting into a hard mass with inhibited wet expansion in the hardened state comprising aluminous cement, gypsum, a drying shrinkage inhibitor and a salt of lithium in an amount effective to act as a wet expansion inhibitor.
Claim 3
Dependent Claim
35 words
A cementitious composition as claimed in claim 1 wherein the salt of lithium is present in an amount ranging from 0.01 to 0.5 percent, by weight, based on the amount of aluminous cement and gypsum.
Claim 4
Dependent Claim
35 words
A cementitious composition as claimed in claim 2 wherein the aluminous cement is present in an amount ranging from 60 to 90 percent, by weight, based on the total weight of aluminous cement and gypsum.
Claim 5
Dependent Claim
34 words
A cementitious composition as claimed in claim 2 wherein the gypsum is present in an amount ranging from 10 to 40 percent, by weight, based on the total weight of aluminous cement and gypsum.
Claim 6
Dependent Claim
36 words
A cementitious composition as claimed in claim 2 wherein the drying shrinkage inhibitor is present in an amount ranging from 0.1 to 25 percent, by weight, based on the total weight of aluminous cement and gypsum.
Claim 7
Dependent Claim
62 words
A cementitious composition comprising 60 to 90 percent, by weight, aluminous cement, 10 to 40 percent, by weight, gypsum, 0.1 to 25 percent, by weight, based on the amount of aluminous cement and gypsum, Portland cement and 0.01 to 0.5 percent, by weight, based on the amount of aluminous cement and gypsum, of a salt of lithium as a wet expansion inhibitor.
Claim 8
Dependent Claim
62 words
A cementitious composition comprising 60 to 90 percent, by weight, aluminous cement, 10 to 40 percent, by weight, gypsum, 0.1 to 25 percent, by weight, based on the amount of aluminous cement and gypsum, Portland cement and 0.01 to 0.5 percent, by weight, based on the amount of aluminous cement and gypsum, of a salt of lithium as a wet expansion inhibitor.
Claim 9
Dependent Claim
87 words
A cementitious composition as claimed in claim 6 wherein the aluminous cement is one selected from the group consisting of high alumina cement, calcium aluminate cement and cement whose main cementitious constituent comprises monocalcium aluminate, the gypsum is one selected from the group consisting of calcium sulfate, calcium sulfate anhydrate, calcium sulfate hemihydrate, calcium sulfate dihydrate, plaster of Paris, calcined gypsum and pressure calcined gypsum and the salt of lithium is one selected from the group consisting of lithium carbonate, lithium citrate, lithium hydroxide and lithium acetate.
Claim 10
Dependent Claim
38 words
A cementitious composition as claimed in claim 6 or 7 wherein the salt of lithium is present in an amount ranging from 0.1 to 0.3 percent, by weight, based on the total amount of aluminous cement and gypsum.
Claim 11
Dependent Claim
40 words
A cementitious composition as claimed in claim 8 wherein the Portland cement is a type III Portland cement present in an amount ranging from 1 to 20 percent, by weight, based on the total amount of aluminous cement and gypsum.
Claim 12
Dependent Claim
78 words
In a cementitious composition which when mixed with water is capable of setting into a hard mass in a short period of time without substantial shrinkage during setting and possessing a high degree of impermeability to fluids, comprising aluminous cement, gypsum and Portland cement the improvement therein enabling inhibition of expansion of the hardened system in the wet state, comprising the addition thereto of a salt of lithium in an amount effective to inhibit hardened state wet expansion.
Claim 13
Dependent Claim
78 words
In a cementitious composition which when mixed with water is capable of setting into a hard mass in a short period of time without substantial shrinkage during setting and possessing a high degree of impermeability to fluids, comprising aluminous cement, gypsum and Portland cement the improvement therein enabling inhibition of expansion of the hardened system in the wet state, comprising the addition thereto of a salt of lithium in an amount effective to inhibit hardened state wet expansion.
Claim 14
Dependent Claim
31 words
An improved cementitious composition as claimed in claim 10 wherein the salt of lithium is one selected from the group consisting of lithium carbonate, lithium citrate, lithium hydroxide and lithium acetate.
Claim 15
Dependent Claim
34 words
An improved cementitious composition as claimed in claim 10 wherein the aluminous cement is a high alumina cement, the gypsum is a pressure calcined gypsum and the Portland cement is a Type III cement.
Claim 16
Dependent Claim
67 words
An improved cementitious composition as claimed in claim 12 wherein the high alumina cement is present in an amount of 80 parts by weight, the gypsum is present in an amount of 20 parts by weight, the Type III Portland cement is present in an amount of 10 parts by weight, and the lithium salt is lithium carbonate present in an amount of 0.2 parts by weight.
Claim 17
Dependent Claim
18 words
An improved composition as claimed in claim 13 further comprising a curing agent to be added after hardening.
Claim 18
Dependent Claim
17 words
An improved composition as claimed in claim 14 further comprising a surface active agent and a retarder.
Claim 19
Independent Claim
33 words
A method of inhibiting wet expansion in the hardened state of a cementitious system comprising aluminous cement, gypsum and a drying shrinkage inhibitor comprising admixing therewith, prior to hardening, a salt of lithium.
Claim 20
Independent Claim
33 words
A method of inhibiting wet expansion in the hardened state of a cementitious system comprising aluminous cement, gypsum and a drying shrinkage inhibitor comprising admixing therewith, prior to hardening, a salt of lithium.
Claim 21
Dependent Claim
15 words
A method as claimed in claim 16 wherein the drying shrinkage inhibitor comprises Portland cement.
Claim 22
Dependent Claim
33 words
A method as claimed in claim 16 or 17 wherein the amount of the salt of lithium admixed comprises from 0.01 to 0.5 percent, by weight, based on the aluminous cement and gypsum.
Claim 23
Dependent Claim
29 words
A method as claimed in claim 18 wherein the salt of lithium comprises one selected from the group consisting of lithium carbonate, lithium citrate, lithium hydroxide and lithium acetate.
Claim 24
Dependent Claim
27 words
A hardened cementitious composition having inhibited wet expansion comprising the reaction products, when mixed with water, of aluminous cement, gypsum, Portland cement and a salt of lithium.
Claim 25
Dependent Claim
27 words
A hardened cementitious composition having inhibited wet expansion comprising the reaction products, when mixed with water, of aluminous cement, gypsum, Portland cement and a salt of lithium.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
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