US4373955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight insulating concrete
Assignee: CHAICAGO BRIDGE & IRON COMPANY A CORP OF ILL
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Filing: 1981-11-04
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Granted: 1983-02-15
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Expires: 2001-11-04
Abstract
Abstract A lightweight insulating concrete having a K value of not more than 0.75, a compressive strength of at least 125 psi and consisting essentially of portland cement, pumice, silica and pulping waste liquor solids. A method of producing a foamed insulating concrete comprising incorporating a hydrolyzed protein based aqueous foam in a slurry of portland cement, pumice, silica, pulping waste liquor and water to form a foamed concrete slurry and then curing the concrete slurry to a solid rigid concrete.
Inventors
- 👤 James P. Bouchard
- 👤 John D. Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B2111/00; C04B2111/20; C04B2111/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A method of producing a foamed insulating concrete consisting essentially of incorporating a hydrolyzed protein based aqueous foam in a slurry of portland cement, pumice, silica, pulping waste liquor and water to form a foamed concrete slurry of the following amounts of ingredients: Portland cement--80 to 95 parts by weight, Pumice--1 to 15 parts by weight, Silica--0.5 to 5 parts by weight, Pulping sulfite waste liquor--0.2 to 2 parts by weight, Hydrolyzed protein based aqueous solution--2 to 4 parts by weight, Water--45 to 60 parts by weight, and then curing the concrete slurry to a solid rigid concrete.
Claim 2
Independent Claim
98 words
A method of producing a foamed insulating concrete consisting essentially of incorporating a hydrolyzed protein based aqueous foam in a slurry of portland cement, pumice, silica, pulping waste liquor and water to form a foamed concrete slurry of the following amounts of ingredients: Portland cement--80 to 95 parts by weight, Pumice--1 to 15 parts by weight, Silica--0.5 to 5 parts by weight, Pulping sulfite waste liquor--0.2 to 2 parts by weight, Hydrolyzed protein based aqueous solution--2 to 4 parts by weight, Water--45 to 60 parts by weight, and then curing the concrete slurry to a solid rigid concrete.
Claim 3
Dependent Claim
25 words
A method according to claim 1 in which the foam contains about 1 to 50 volumes of air per volume of water in the foam.
Claim 4
Dependent Claim
20 words
A method according to claim 1 or 2 in which the pulping waste liquor is a pulping sulfite waste liquor.
Claim 5
Dependent Claim
28 words
A method according to claim 1 in which the concrete slurry is molded into a shape and at least partially cured in an autoclave at an elevated temperature.
Claim 6
Dependent Claim
25 words
A method according to claim 4 in which the concrete is at least partially cured in the autoclave at an increased pressure above atmospheric pressure.
Claim 7
Dependent Claim
43 words
A method according to claim 5 in which the increased pressure is up to about 150 psig at the start of curing and the pressure is lowered to about atmospheric pressure near the end of curing to prevent crack formation in the concrete.
Claim 8
Dependent Claim
38 words
A method according to claim 1 in which the concrete slurry is molded into a shape and is at least partially cured in an autoclave at about atmospheric temperature above freezing and an increased pressure above atmospheric pressure.
Claim 9
Dependent Claim
23 words
A method according to claim 1 or 2 in which the foam has a density of 1 to 2.5 pounds per cubic foot.
Claim 10
Dependent Claim
26 words
A method according to claim 1 or 2 in which the foamed concrete slurry has a wet density of 30 to 50 pounds per cubic foot.
Claim 11
Dependent Claim
35 words
A method according to claim 1 in which approximately the following materials are used: Portland cement--94 pounds Pumice--8±2 pounds Silica--2±1 pounds Pulping waste sulfite liquor--6±2 ounces Hydrolyzed protein based aqueous foam--3±0.2 cubic feet Water--6±0.5 gallons
Claim 12
Dependent Claim
41 words
A lightweight insulating concrete produced by the process of claim 1, having a K value of not more than 0.75, a compressive strength of at least 125 psi and consisting essentially of portland cement, pumice, silica and pulping waste liquor solids.
Claim 13
Dependent Claim
21 words
A lightweight insulating concrete according to claim 11 in which the pulping waste liquid solids are from pulping sulfite waste liquor.
Claim 14
Dependent Claim
17 words
A lightweight insulating concrete according to claim 11 having good load bearing properties in low temperature use.
Claim 15
Dependent Claim
22 words
A lightweight insulating concrete according to claim 11 or 12 having a density of about 20 to 40 pounds per cubic foot.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |