US5169566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engineered cementitious contaminant barriers and their method of manufacture
Assignee: EKHASHOGGI INDUSTRIES A PARTNERSHIP OF CALIFORNIA
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Filing: 1990-11-28
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Granted: 1992-12-08
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Expires: 2010-11-28
Abstract
Abstract Novel cementitious contaminant barriers are formed by positioning a hydraulic cement composition into a predetermined configuration and then hydrating the cement composition. The contaminant barriers of the present invention include at least one liquid, gas, or ion getter capable of binding with or absorbing liquids, ions, or gases which may penetrate the barrier. The contaminant barriers of the present invention may be engineered to include mixtures of different getters, single and multiple layers of different getters, multiple layers of cement and getters, and a host of different getter, cement, mixture, and layer combinations. Novel waste containers are advantageously prepared utilizing contaminant barriers within the scope of the present invention. The waste containers may be prepared by surrounding waste material with at least one getter and with a powdered hydraulic cement composition and then compressing the cement and getter around the waste material. Preformed waste containers may also be prepared within the scope of the present invention. Use of reinforcing fibers and aggregates to improve the mechanical properties of the hazardous waste container is disclosed.
Inventors
- 👤 Galen Stucky
- 👤 Hamlin M. Jennings
- 👤 Simon K. Hodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:38
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/24; B28B1/00; B28B11/245; B28B23/00; B28B23/0081; B28B23/0087; B28B7/00; B28B7/34; B28B7/342; C; C04; C04B; C04B22/00; C04B22/002; C04B28/00; C04B28/02; C04B40/00; C04B40/0028; C04B40/0035; C04B40/06; C04B40/0608; C04B40/0616; C04B7/00; C04B7/36; C04B7/48; C04B7/52; C04B7/527; G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/304; G21F9/34; C04B2111/00; C04B2111/00474; C04B2111/00767; C04B2111/00775
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
76 words
A method for preparing a contaminant barrier from a hydraulically bonded cement composition, the method comprising the steps of: (a) deliberately positioning a powdered hydraulic cement composition and at least one getter into a near net final position substantially corresponding to a desired contaminant barrier shape, said getter being capable of preventing passage of a contaminant through the barrier; and (b) hydrating the powdered hydraulic cement composition without substantial mechanical mixing of the cement and water.
Claim 2
Independent Claim
76 words
A method for preparing a contaminant barrier from a hydraulically bonded cement composition, the method comprising the steps of: (a) deliberately positioning a powdered hydraulic cement composition and at least one getter into a near net final position substantially corresponding to a desired contaminant barrier shape, said getter being capable of preventing passage of a contaminant through the barrier; and (b) hydrating the powdered hydraulic cement composition without substantial mechanical mixing of the cement and water.
Claim 3
Dependent Claim
22 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes an ion getter.
Claim 4
Dependent Claim
22 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a liquid getter.
Claim 5
Dependent Claim
22 words
A method for preparing a contaminant barrier as defined in claim 1 wherein the at least one getter includes a gas getter.
Claim 6
Dependent Claim
30 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition is hydrated by contacting the powdered hydraulic cement composition with gaseous water.
Claim 7
Dependent Claim
28 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition is hydrated in a controlled gaseous environment including carbon dioxide.
Claim 8
Dependent Claim
31 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition is hydrated by contacting the powdered hydraulic cement composition with an aqueous solution.
Claim 9
Dependent Claim
24 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition has a predetermined polymodal size distribution.
Claim 10
Dependent Claim
32 words
A method for preparing a contaminant barrier as defined in claim 1, further comprising the step of deliberately positioning an aggregate within the powdered hydraulic cement composition prior to hydrating the cement.
Claim 11
Dependent Claim
27 words
A method for preparing a contaminant barrier as defined in claim 9, wherein the aggregate comprises a plurality of aggregate particles having a predetermined polymodal size distribution.
Claim 12
Dependent Claim
20 words
A method for preparing a contaminant barrier as defined in claim 9, wherein the aggregate includes a plurality of fibers.
Claim 13
Dependent Claim
38 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition and the at least one getter are compressed into the near net final position by isostatic compression in a mold.
Claim 14
Dependent Claim
25 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement includes a mixture of chemically different hydraulic cements.
Claim 15
Dependent Claim
21 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement includes a Portland cement.
Claim 16
Dependent Claim
19 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the contaminant includes a radioactive waste.
Claim 17
Dependent Claim
20 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the contaminant includes a heavy metal ion.
Claim 18
Dependent Claim
19 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the contaminant includes a gas generator.
Claim 19
Dependent Claim
21 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the contaminant includes both radioactive and hazardous waste.
Claim 20
Dependent Claim
21 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a zeolite.
Claim 21
Dependent Claim
24 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a mixture of different zeolites.
Claim 22
Dependent Claim
22 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a layered clay.
Claim 23
Dependent Claim
24 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a mixture of layered clays.
Claim 24
Dependent Claim
32 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a mixture of at least one zeolite and at least one layered clay.
Claim 25
Dependent Claim
24 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the at least one getter includes a mixture of different getters.
Claim 26
Dependent Claim
47 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition includes a water-containing compound, such that at least a portion of the water necessary for hydrating the powdered hydraulic cement is capable of being provided by the water-containing compound.
Claim 27
Dependent Claim
24 words
A method for preparing a contaminant barrier as defined in claim 1, wherein a portion of the powdered hydraulic cement composition remains substantially unhydrated.
Claim 28
Dependent Claim
31 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the powdered hydraulic cement composition and the at least one getter are deliberately positioned in substantially separate layers.
Claim 29
Independent Claim
29 words
A method for preparing a contaminant barrier as defined in claim wherein the powdered hydraulic cement composition and the at least one getter are deliberately positioned as a mixture.
Claim 30
Dependent Claim
26 words
A method for preparing a contaminant barrier as defined in claim 1, wherein the desired contaminant barrier shape is in the form of a waste container.
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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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |