US4105463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lime-fly ash-aggregate-sludge paving material
Assignee: University of Toledo
•
Filing: 1975-12-11
•
Granted: 1978-08-08
•
Expires: 1995-12-11
Abstract
Abstract A composition and method for producing an improved lime-fly ash-aggregate is disclosed. The composition is prepared by mixing together lime, flyash, graded aggregate, adding water, and from 0.5 to 4 percent, based on total dry weight, of sludge from a water treatment plant. The mixture is placed on top of a prepared subgrade, spread uniformly, and compacted to a high degree of relative density to provide the main load-carrying component of a road, airport runway, parking lot or the like.
Inventors
- 👤 Donald I. Angelbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:44
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B18/00; C04B18/04; C04B18/0418; C04B2111/00; C04B2111/00474; C04B2111/0075; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
In a pozzolanic paving material consisting essentially of lime, fly ash, aggregate, and water; the improvement consisting of from 0.5 to 4 percent by weight, based on said lime, fly ash and aggregate, of a water treatment sludge consisting essentially of at least one compound selected from the group consisting of calcium oxide and calcium carbonate, and at least one compound selected from the group consisting of the oxides and hydroxides of aluminum and iron.
Claim 2
Dependent Claim
75 words
In a pozzolanic paving material consisting essentially of lime, fly ash, aggregate, and water; the improvement consisting of from 0.5 to 4 percent by weight, based on said lime, fly ash and aggregate, of a water treatment sludge consisting essentially of at least one compound selected from the group consisting of calcium oxide and calcium carbonate, and at least one compound selected from the group consisting of the oxides and hydroxides of aluminum and iron.
Claim 3
Dependent Claim
94 words
A pozzolanic paving material according to claim 1 consisting essentially of from 2 to 8 percent by weight lime, from 8 to 36 percent by weight fly ash, from 66 to 90 percent by weight aggregate, water, and from 0.5 to 4 percent by weight, based on said lime, fly ash and aggregate, of water treatment sludge consisting essentially of at least one compound selected from the group consisting of calcium oxide and calcium carbonate, and at least one compound selected from the group consisting of the oxides and hydroxides of aluminum and iron.
Claim 4
Dependent Claim
38 words
A paving material as claimed in claim 2 wherein the sludge additionally contains up to 10 percent by weight of magnesium compound, calculated as MgO and up to 10 percent by weight silicon, calculated as SiO 2 .
Claim 5
Dependent Claim
38 words
A paving material as claimed in claim 2 wherein the sludge additionally contains up to 1 percent by weight phosphorus compound calculated as PO 4 , and up to 2 percent by weight manganese compound calculated as MnO.
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) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |