US4565840A
Expired / Lapsed
US
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Fiber-reinforced concrete and reinforcing material for concrete
Assignee: Mitsui Chemicals Inc
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Filing: 1984-06-11
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Granted: 1986-01-21
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Expires: 2004-06-11
Abstract
Abstract A fiber-reinforced concrete comprising two kinds of short fibers, one being a short fiber having a Young's modulus higher than that of concrete, the other being a short fiber which has a Young's modulus lower than that of concrete and showing good adhesiveness to concrete. The both fibers are mixed in a predetermined ratio and dispersed in a concrete matrix. A reinforcing material for concrete is also disclosed which material consisting of such fibers as mentioned above.
Inventors
- 👤 Kazusuke Kobayashi
- 👤 Ryokche Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; C; C04; C04B; C04B16/00; C04B16/04; C04B16/06; C04B16/0616; C04B16/0625; C04B20/00; C04B20/0048; C04B20/0052; C04B28/00; C04B28/02; E; E04; E04C; E04C5/00; E04C5/01; E04C5/012; E04C5/07; E04C5/073; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2976; Y10T428/2978
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
146 words
A fiber-reinforced, craze-resistant and high tensile strength concrete composite comprising a concrete matrix containing from 1 to 6% by volume of a mixture of short steel fibers (A) having a length of about 20 to 60 mm. and a Young's modulus higher than that of concrete and short polyethylene fibers (B) having a length of about 5 to 100 mm. and a Young's modulus lower than concrete, said fibers (B) further having surface protrusions along the longitudinal axis so that the fiber is firmly adhesive to the concrete matrix, with both of said fibers being dispersed in the concrete matrix in a volume ratio (B)/(A) ranging from about 0.5 to 6, the reinforcing amount of short steel fibers (A) ranging from about 0.5 to about 3% by volume and the reinforcing amount of short polyethylene fibers (B) ranging from about 0.5 to about 5% by volume.
Claim 2
Dependent Claim
146 words
A fiber-reinforced, craze-resistant and high tensile strength concrete composite comprising a concrete matrix containing from 1 to 6% by volume of a mixture of short steel fibers (A) having a length of about 20 to 60 mm. and a Young's modulus higher than that of concrete and short polyethylene fibers (B) having a length of about 5 to 100 mm. and a Young's modulus lower than concrete, said fibers (B) further having surface protrusions along the longitudinal axis so that the fiber is firmly adhesive to the concrete matrix, with both of said fibers being dispersed in the concrete matrix in a volume ratio (B)/(A) ranging from about 0.5 to 6, the reinforcing amount of short steel fibers (A) ranging from about 0.5 to about 3% by volume and the reinforcing amount of short polyethylene fibers (B) ranging from about 0.5 to about 5% by volume.
Claim 3
Dependent Claim
33 words
The fiber-reinforced concrete composite as defined by claim 1, said steel fibers having a Young's modulus ranging from about 19,000 to 21,000 kg/mm 2 , being about 0.2 to 1 mm in thickness.
Claim 4
Dependent Claim
36 words
The fiber-reinforced concrete composite as defined by claim 1, said short steel fibers (A) having a Young's modulus ranging from about 4,500 to about 30,000 kg/mm 2 , being about 0.2 to 1 mm in thickness.
Claim 5
Dependent Claim
21 words
The fiber-reinforced concrete composite as defined by claim 3, said polyethylene fibers having a denier ranging from about 100 to 50,000.
Claim 6
Dependent Claim
51 words
The fiber-reinforced concrete composite as defined by claim 3, said surface protrusions are of a number ranging from about 5 to 25 per each 10 cm length of fiber (B), having a height of at least 0.1 mm and a diameter of fiber (B) ranging from about 0.5 to 2 mm.
Claim 7
Dependent Claim
48 words
The fiber-reinforced concrete composite as defined by claim 4, said surface protrusions being of a number ranging from about 5 to 25 per each 10 cm length of fiber (B), having a height of at least 0.1 mm and a diameter ranging from about 0.5 to 2 mm.
Claim 8
Dependent Claim
26 words
The fiber-reinforced concrete composite as defined by claim 6, said polyethylene fibers being longitudinally oriented and having a Young's modulus of about 500 kg/mm 2 .
Claim 9
Dependent Claim
40 words
The fiber-reinforced concrete composite as defined by claim 1, the amount of the short fibers (A) ranging from about 1 to 2% by volume, and the amount of the short fibers (B) ranging from about 1 to 4% by volume.
Claim 10
Dependent Claim
18 words
The fiber-reinforced concrete composite as defined by claim 1, the ratio (B)/(A) ranging from about 1 to 3.
Claim 11
Dependent Claim
17 words
A craze-resistant, high tensile strength reinforced concrete comprising the fiber-reinforced concrete composite as defined by claim 1.
Claim 12
Dependent Claim
25 words
The fiber-reinforced concrete composite as defined by claim 5, said number ranging from about 7 to 20 per each 10 cm length of fiber (B).
Claim 13
Dependent Claim
25 words
The fiber-reinforced concrete composite as defined by claim 5, said number ranging from about 10 to 16 per each 10 cm length of fiber (B).
Claim 14
Dependent Claim
30 words
The fiber-reinforced concrete composite as defined by claim 6, said polyethylene fibers being about 10 to 80 mm in length, and having a denier ranging from about 1,000 to 15,000.
Claim 15
Dependent Claim
30 words
The fiber-reinforced concrete composite as defined by claim 6, said polyethylene fibers being about 20 to 60 mm in length, and having a denier ranging from about 3,000 to 12,000.
Claim 16
Dependent Claim
32 words
The fiber-reinforced concrete composite as defined by any of claim 3 or 2, said short reinforcing fibers (B) having a Young's modulus ranging from about 100 to about 1,000 kg/mm 2 .
Claim 17
Dependent Claim
15 words
Craze-resistant, high tensile strength reinforced concrete element made from said concrete composite of claim 1.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |