US4070199A
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Cementitious compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-10-27
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Granted: 1978-01-24
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Expires: 1996-10-27
Abstract
Abstract Cured cementitious compositions having a modulus of rupture of greater than 15 MN/m 2 are prepared by curing and drying a homogeneous uncured cementitious composition which comprises in defined proportions hydraulic cement, water and a selected water-dispersible polymer.
Inventors
- 👤 Stephen Barry Downing
- 👤 Desmond Wilfred John Osmond
- 👤 Maurice Wainwright Skinner
- 👤 Edmund James West
- 👤 David George Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:52
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
208 words
A homogeneous uncured cementitious composition which comprises the ingredients: a. a hydraulic cement selected from the group consisting of cements which comprise compounds of calcium, aluminum, silicon, oxygen and/or sulfur which set and harden by reaction with water, b. water, and c. a water-dispersible polymer, wherein i. the ratio of water to hydraulic cement is in the range 15 - 28 parts by weight of water to 100 parts by weight of hydraulic cement; ii. the ratio of water-dispersible polymer to hydraulic cement is in the range 0.1 - 3.0 parts by weight of water dispersible polymer to 100 parts by weight of hydraulic cement; and iii. the water-dispersible polymer is selected, with reference to the hydraulic cement and to the selected proportions of polymer and water, for its suitability to facilitate homogenization and to yield on homogenization an uncured composition which can be shaped under pressure and which is shape retaining, and wherein the ingredients (a), (b) and (c) have been subjected to a homogenization process of dispersion and homogenization so that they are regularly dispersed throughout the composition; such that on curing and drying, the homogeneous uncured composition yields a cured and dried cementitious composition having a modulus of rupture greater than 15 MN/m 2 .
Claim 2
Dependent Claim
208 words
A homogeneous uncured cementitious composition which comprises the ingredients: a. a hydraulic cement selected from the group consisting of cements which comprise compounds of calcium, aluminum, silicon, oxygen and/or sulfur which set and harden by reaction with water, b. water, and c. a water-dispersible polymer, wherein i. the ratio of water to hydraulic cement is in the range 15 - 28 parts by weight of water to 100 parts by weight of hydraulic cement; ii. the ratio of water-dispersible polymer to hydraulic cement is in the range 0.1 - 3.0 parts by weight of water dispersible polymer to 100 parts by weight of hydraulic cement; and iii. the water-dispersible polymer is selected, with reference to the hydraulic cement and to the selected proportions of polymer and water, for its suitability to facilitate homogenization and to yield on homogenization an uncured composition which can be shaped under pressure and which is shape retaining, and wherein the ingredients (a), (b) and (c) have been subjected to a homogenization process of dispersion and homogenization so that they are regularly dispersed throughout the composition; such that on curing and drying, the homogeneous uncured composition yields a cured and dried cementitious composition having a modulus of rupture greater than 15 MN/m 2 .
Claim 3
Dependent Claim
88 words
A homogeneous uncured cementitious composition according to claim 1 wherein the water-dispersible polymer is further selected with reference to the hydraulic cement by a test which demonstrates a significant prolongation of the time which is required by a mixture of the water-dispersible polymer, hydraulic cement, and water in defined weight proportions to reach a maximum rate of heat evolution compared with the time which is required to reach a maximum rate of heat evolution by a mixture of hydraulic cement and water alone in the same weight proportions.
Claim 4
Dependent Claim
33 words
A homogeneous uncured cementitious composition according to claim 1 which on curing and drying yields a cured and dried cementitious composition having a modulus of rupture of greater than 20 MN/m -2 .
Claim 5
Dependent Claim
33 words
A homogeneous uncured cementitious composition according to claim 1 which on curing and drying yields a cured and dried cementitious composition having a modulus of rupture of greater than 30 MN/m -2 .
Claim 6
Dependent Claim
22 words
A homogeneous uncured cementitious composition according to claim 1 wherein the hydraulic cement comprises a Portland cement or a high alumina cement.
Claim 7
Dependent Claim
32 words
A homogeneous uncured cementitious composition according to claim 1 wherein the hydraulic cement comprises a mixture of a principal cement and 0.2-20% by weight based on the principal cement of a co-cement.
Claim 8
Dependent Claim
37 words
A homogeneous uncured cementitious composition according to claim 1 wherein the ratio of water to hydraulic cement is in the range 16 - 25 parts by weight of water to 100 parts by weight of hydraulic cement.
Claim 9
Dependent Claim
38 words
A homogeneous uncured cementitious composition according to claim 1 wherein the ratio of water-dispersible polymer to hydraulic cement is in the range 0.5 - 2.0 parts by weight of polymer to 100 parts by weight of hydraulic cement.
Claim 10
Dependent Claim
32 words
A homogeneous uncured cementitious composition according to claim 1 wherein the water-dispersible polymer is selected from non-ionic alkyl or hydroxy alkyl cellulose ethers and non-ionic polymers and copolymers of acrylamide and methacrylamide.
Claim 11
Dependent Claim
23 words
A homogeneous uncured cementitious composition according to claim 1 wherein the ingredients are subjected to a homogenisation process which comprises high shear mixing.
Claim 12
Dependent Claim
21 words
A homogeneous uncured cementitious composition according to claim 1 wherein the ingredients are subjected to a homogenisation process which comprises extrusion.
Claim 13
Dependent Claim
21 words
A homogeneous uncured cementitious composition according to claim 1 wherein the ingredients are subjected to a homogenisation process which comprises calendering.
Claim 14
Dependent Claim
19 words
A homogeneous uncured cementitious composition according to claim 1 which comprises a fibre other than an inorganic mineral fibre.
Claim 15
Dependent Claim
20 words
A homogeneous uncured cementitious composition according to claim 13 wherein the fibre is of a natural or synthetic organic polymer.
Claim 16
Dependent Claim
18 words
A homogeneous uncured cementitious composition according to claim 14 wherein the fibre is nylon fibre or polypropylene fibre.
Claim 17
Dependent Claim
17 words
A homogeneous uncured cementitious composition according to claim 13 wherein the fibre is a synthetic inorganic fibre.
Claim 18
Dependent Claim
15 words
A homogeneous uncured cementitious composition according to claim 16 wherein the fibre is glass fibre.
Claim 19
Dependent Claim
57 words
A homogeneous uncured cementitious composition according to claim 13 wherein the fibre is present in a proportion which is not greater than the critical volume of that fibre with respect to the cured composition i.e. it does not increase the modulus of rupture of the cured composition beyond the limit of proportionality of the fibre-free cured composition.
Claim 20
Dependent Claim
54 words
A homogeneous uncured cementitious composition according to claim 13 wherein the fibre is present in a proportion which is greater than the critical volume of that fibre with respect to the cured composition i.e. it increases the modulus of rupture of the cured composition beyond the limit of proportionality of the fibre-free cured composition.
Claim 21
Dependent Claim
60 words
A method of producing a homogeneous uncured cementitious composition, which when cured and dried yields a cured cementitious composition having a modulus of rupture greater than 15 MN/m -2 , which comprises subjecting to a homogenization process of dispersion and homogenization ingredients (a), (b) and (c) as defined in claim 1 so that they are regularly dispersed throughout the composition.
Claim 22
Dependent Claim
19 words
A method according to claim 20 wherein the homogenisation process comprises a mixing process followed by an extrusion process.
Claim 23
Dependent Claim
19 words
A method according to claim 20 wherein the homogenisation process comprises a mixing process followed by a calendering process.
Claim 24
Dependent Claim
12 words
A method according to claim 20 wherein the uncured composition is shaped.
Claim 25
Dependent Claim
35 words
A method of producing a cured and dried cementitious composition having a modulus of rupture greater than 15 MN/m -2 which comprises curing and drying a homogeneous uncured cementitious composition as claimed in claim 1.
Claim 26
Dependent Claim
54 words
A method according to claim 24 wherein the uncured cementitious composition is cured for at about least 3 days, and preferably at least 7 days, at 100% relative humidity at a temperature of at least 20° C and is thereafter dried for at least 24 hours at a temperature of at least 50° C.
Claim 27
Dependent Claim
26 words
A cured and dried cementitious composition comprising cured hydraulic cement and a water-dispersible polymer which has a modulus of rupture greater than 15 MN/m 2 .
Claim 28
Dependent Claim
26 words
A cured and dried cementitious composition comprising cured hydraulic cement and a water-dispersible polymer which has a modulus of rupture greater than 15 MN/m 2 .
Claim 29
Dependent Claim
22 words
A cured and dried cementitious composition according to claim 26 which has a modulus of rupture greater than 20 MN/m 2 .
Claim 30
Dependent Claim
22 words
A cured and dried cementitious composition according to claim 27 which has a modulus of rupture greater than 30 MN/m -2 .
Claim 31
Dependent Claim
33 words
A cured and dried cementitious composition according to claim 26 which comprises a fibrous material in a proportion not greater than the critical volume of that fibre with respect to the fibre-free composition.
Claim 32
Dependent Claim
32 words
A cured and dried cementitious composition according to claim 26 which comprises a fibrous material in a proportion greater than the critical volume of that fibre with respect to the fibre-free composition.
Claim 33
Dependent Claim
20 words
A cured and dried cementitious composition prepared by curing and drying a homogeneous uncured cementitious composition according to claim 1.
Claim 34
Dependent Claim
15 words
A shaped article which comprises a cured and dried cementitious composition according to claim 31.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |