US4050950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled density fill material containing fly ash
Assignee: J W BRETT Inc
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Filing: 1975-12-03
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Granted: 1977-09-27
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Expires: 1995-12-03
Abstract
Abstract The invention relates to a controlled density fill material and a method of using such fill material in, for examples, the backfilling of sewers, embankments, structures and utility trenches. The material includes Portland cement, fly ash and aggregates. The material, while having some properties of both, is neither a soil nor a concrete.
Inventors
- 👤 William E. Brewer
- 👤 Franklin V. Zimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:37
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/08; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A controlled density fill material consisting essentially of 2% to 6% by weight of Portland cement, 2% to 10% by weight of fly ash, 70% to 90% by weight of aggregate and 5% to 15% by weight of water, the fill material being sufficiently placeable and flowable that tamping or vibrating is unnecessary and having a concrete-comparison 28-day compressive strength of less than 1400 psi, whereby the material may be easily re-excavated.
Claim 2
Dependent Claim
72 words
A controlled density fill material consisting essentially of 2% to 6% by weight of Portland cement, 2% to 10% by weight of fly ash, 70% to 90% by weight of aggregate and 5% to 15% by weight of water, the fill material being sufficiently placeable and flowable that tamping or vibrating is unnecessary and having a concrete-comparison 28-day compressive strength of less than 1400 psi, whereby the material may be easily re-excavated.
Claim 3
Dependent Claim
49 words
A controlled density fill material, according to claim 1, wherein the controlled density fill material consists essentially of 2% to 5% by weight of Portland cement, 2% to 9% by weight of fly ash, 74% to 86% by weight of aggregate and 8% to 13% by weight of water.
Claim 4
Dependent Claim
49 words
A controlled density fill material, according to claim 1, wherein the controlled density fill material consists essentially of 4% to 6% by weight of Portland cement, 2% to 9% by weight of fly ash, 75% to 90% by weight of aggregate and 6% to 10% by weight of water.
Claim 5
Dependent Claim
16 words
The controlled density fill material defined by claim 1, wherein the aggregate comprises a berm aggregate.
Claim 6
Dependent Claim
16 words
The controlled density fill material defined by claim 1, wherein the aggregate comprises Maumee Estuary sand.
Claim 7
Dependent Claim
23 words
The controlled density fill material defined by claim 1, wherein the concrete-comparison 28-day compressive strength is substantially between 100 psi and 300 psi.
Claim 8
Dependent Claim
19 words
The controlled density fill material defined by claim 1, wherein the concrete-comparison 28-day compressive strength is about 200 psi.
Claim 9
Dependent Claim
36 words
The controlled density fill material according to claim 1 which consists essentially of 4% by weight of Portland cement, 2.6% by weight of fly ash, 82.4% by weight of aggregate and 11% by weight of water.
Claim 10
Dependent Claim
19 words
The controlled density fill material defined by claim 1, wherein the concrete-comparison 28-day compressive strength is about 1000 psi.
Claim 11
Dependent Claim
34 words
The controlled density fill material of claim 1 which essentially comprises 4.8% by weight of Portland cement, 7.3% by weight of fly ash, 78.7% by weight of aggregate and 9.2% by weight of water.
Claim 12
Dependent Claim
35 words
The controlled density fill material according to claim 1 which essentially comprises 4.8% by weight of Portland cement, 4.8% by weight of fly ash, 82.9% by weight of aggregate and 7.5% by weight of water.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |