US3854968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lime-fly ash cementitious mixture with improved hardening and expansion characteristics
Assignee: CONVERSION SYSTEMS OF PENNSYLVANIA Inc
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Filing: 1972-02-15
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Granted: 1974-12-17
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Expires: 1992-02-15
Abstract
Abstract Cementitious mixture comprised of fly ash and lime-sulfate material, as contrasted with lime as used in conventional mixtures, hardens more rapidly and has improved characteristics with respect to dimensional stability. Preferably, the limesulfate material is made by the addition of sulfuric acid solution to quicklime in a modified lime hydration process. Alternatively, the lime-sulfate material may comprise lime and a separate sulfate compound such as gypsum. The cementitious mixture of this invention may be used, alone or in conjunction with filler material, as a subsurface base material or as a soil stabilization agent. It may also find use as a land fill or in making pre-stressed structural members.
Inventors
- 👤 L Minnick
- 👤 W Webster
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065; C04B2/00; C04B2/02; C04B2/04; C04B2/06; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
A METHOD OF PRODUCING A HIGHLY REACTIVE SULFATED LIME PRODUCT COMPRISING
Claim 2
Independent Claim
11 words
A METHOD OF PRODUCING A HIGHLY REACTIVE SULFATED LIME PRODUCT COMPRISING
Claim 3
Dependent Claim
79 words
CONTACTING QUICKLIME WITH A. SULFURIC ACID, THE QUANTITY OF SAID SULFURIC ACID BEING LIMITED SO THAT THE MOLE RATIO OF SULFURIC ACID TO QUICKLIME DOES NOT EXCEED 3.3 : 4.3, AND B. WATER IN AN AMOUNT SUFFICIENT TO HYDRATE THAT PORTION OF THE QUICKLIME NOT CONVERTED TO SULFATE COMPOUNDS BY REACTION WITH THE SULFURIC ACID, II. AND PERMITTING SAID MATERIALS TO REMAIN IN CONTACT UNTIL REACTION THEREBETWEEN IS SUBSTANTIALLY COMPLETE AND ANY EXCESS WATER IS SUBSTANTIALLY REMOVED BY VOLATILIZATION.
Claim 4
Dependent Claim
79 words
CONTACTING QUICKLIME WITH A. SULFURIC ACID, THE QUANTITY OF SAID SULFURIC ACID BEING LIMITED SO THAT THE MOLE RATIO OF SULFURIC ACID TO QUICKLIME DOES NOT EXCEED 3.3 : 4.3, AND B. WATER IN AN AMOUNT SUFFICIENT TO HYDRATE THAT PORTION OF THE QUICKLIME NOT CONVERTED TO SULFATE COMPOUNDS BY REACTION WITH THE SULFURIC ACID, II. AND PERMITTING SAID MATERIALS TO REMAIN IN CONTACT UNTIL REACTION THEREBETWEEN IS SUBSTANTIALLY COMPLETE AND ANY EXCESS WATER IS SUBSTANTIALLY REMOVED BY VOLATILIZATION.
Claim 5
Dependent Claim
27 words
The method, as recited in claim 1, wherein the heat necessary for volatilization of said excess water is provided by the heat of reaction from said process.
Claim 6
Dependent Claim
16 words
A dry, particulate reactive sulfated lime material produced in accordance with the method of claim 1.
Claim 7
Dependent Claim
40 words
A cementitious mixture comprised of sulfated lime, as recited in claim 3, and fly ash, wherein the sulfate compound portion of said sulfated lime constitutes at least 1%, by weight, of the total of said fly ash and sulfated lime.
References Cited (Backward Citations)
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Cited
US1033984A
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US1834799A
Cited
US1604574A
Cited
US2241604A
Cited
US2564690A
Cited
US3565648A
Cited
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |