Patent US4790691A successfully refreshed from Google Patents.
US4790691A
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US
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Fiber reinforced soil and method
Assignee: Synthetic Industries
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Filing: 1986-10-03
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Granted: 1988-12-13
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Expires: 2006-10-03
Abstract
Abstract Composite mixtures comprise soil and from about 0.1 to 5 percent by weight of additive fiber. A related method for improving the engineering properties of soil includes the steps of adding from about 0.1 to 5 percent by weight of fibers to soil and mixing the fibers and soil together to form a blend.
Inventors
- 👤 W. Wayne Freed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:32
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/36; C; C09; C09K; C09K17/00; C09K17/14; C09K17/16; C09K17/40; E02; E02D; E02D3/00; E02D3/005; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
Reinforced soil having improved engineering properties for construction and excavation purposes comprising: natural soil selected from the group consisting of gravel, sand, silt, clay and mixtures thereof; and from about 0.1 to 5 percent by weight of a fiber additive mixed therein to improve the punching shear resistance, the total angle of internal friction, the average total cohesion and the average initial tangent modulus of said soil, said fiber additives being selected from the class consisting of thermoplastic polymers and fiberglass which fiber additives do not deteriorate in soil.
Claim 2
Dependent Claim
89 words
Reinforced soil having improved engineering properties for construction and excavation purposes comprising: natural soil selected from the group consisting of gravel, sand, silt, clay and mixtures thereof; and from about 0.1 to 5 percent by weight of a fiber additive mixed therein to improve the punching shear resistance, the total angle of internal friction, the average total cohesion and the average initial tangent modulus of said soil, said fiber additives being selected from the class consisting of thermoplastic polymers and fiberglass which fiber additives do not deteriorate in soil.
Claim 3
Dependent Claim
16 words
Reinforced soil, as set forth in claim 1, wherein said soil is a low plasticity silt.
Claim 4
Dependent Claim
13 words
Reinforced soil, as set forth in claim 1, wherein said fibers are polyolefinic.
Claim 5
Dependent Claim
13 words
Reinforced soil, as set forth in claim 3, wherein said fibers are polypropylene.
Claim 6
Dependent Claim
13 words
Reinforced soil, as set forth in claim 1, wherein said fibers are polyesters.
Claim 7
Dependent Claim
29 words
Reinforced soil, as set forth in claim 1, wherein said fibers are from about 1.25 to 10 cm long and have a diameter of about 0.25 to 2.5 mm.
Claim 8
Dependent Claim
22 words
Reinforced soil, as set forth in claim 1, wherein the specific gravity of said thermoplastic fibers ranges from about 0.80 to 1.96.
Claim 9
Dependent Claim
21 words
Reinforced soil, as set forth in claim 1, wherein the specific gravity of said fiberglass ranges from about 2.5 to 2.7.
Claim 10
Independent Claim
114 words
A method for improving the engineering properties of natural soils for construction and excavation purposes comprising the steps of: adding from about 0.1 to 5 percent by weight of a fiber additive to natural soil to improve the punching shear resistance, the total angle of internal friction, the average total cohesion and the average initial tangent modulus of said soil, wherein said fiber additives are selected from the class consisting of thermoplastic polymers and fiberglass which fiber additives do not deteriorate in soil and said natural soil is selected from the group consisting of gravel, sand, silt, clay and mixtures thereof; and mixing said fiber additives and natural soil together to form a blend.
Claim 11
Independent Claim
114 words
A method for improving the engineering properties of natural soils for construction and excavation purposes comprising the steps of: adding from about 0.1 to 5 percent by weight of a fiber additive to natural soil to improve the punching shear resistance, the total angle of internal friction, the average total cohesion and the average initial tangent modulus of said soil, wherein said fiber additives are selected from the class consisting of thermoplastic polymers and fiberglass which fiber additives do not deteriorate in soil and said natural soil is selected from the group consisting of gravel, sand, silt, clay and mixtures thereof; and mixing said fiber additives and natural soil together to form a blend.
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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) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |