US3887386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fibres and compositions containing glass fibres
Assignee: National Research Development Corp UK
•
Filing: 1973-07-24
•
Granted: 1975-06-03
•
Expires: 1993-07-24
Abstract
Abstract Fibre reinforced cementitious products are described comprising glass fibrous material distributed throughout a cement matrix, in which the glass is one having per se a degree of alkali resistance such that when tested in the form of an abraded fibre of length 2 1/2 inches and diameter of from 0.4 to 1.0 X 10 3 inches said fibre has a tensile strength of at least 100,000 p.s.i. after treatment with saturated aqueous Ca(OH)2 solution at 100*C. for 4 hours followed by successive washings at ambient temperature with water, then with aqueous hydrochloric acid (1%) for 1 minute, water, acetone, following by drying, said fibre experiencing not more than 10% reduction in diameter during said test. The reinforcement of Portland cement structures by fibres of diameter 0.4 to 1.0 X 10 3 and lengths of up to 4 inches is described. Alkali resistant glasses useful for production of these products comprise the CaO-MgO-Al2O3-SiO2 glasses including those in the anorthite field, silica zirconia glasses, and silica stannic oxide glasses. The products have outstanding durability and impact resistance.
Inventors
- 👤 Amalendu Jyoti Majumdar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:43
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C13/00; C03C13/001; C03C13/002; C03C3/078; C03C3/083; C03C3/085; C03C3/087; C03C3/095; C03C3/11; C03C3/112; C04; C04B; C04B14/00; C04B14/38; C04B14/42; C04B26/00; C04B26/02; C04B26/10; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
135 words
A COMPOSITE FIBRE/CEMENTITIOUS PRODUCT COMPRISING FIBROUS MATERIAL DISTRIBUTED THROUGHOUT A CEMENT MATRIX AS A REINFORCING MATERIAL AND SUBJECT WHERE THE SURFACE IS EXPOSED TO THE CEMENT MATRIX, TO THE CORROSIVE ACTION OF SAID MATRIX, IN WHICH THE REINFORCING MATERIAL IS PRIMARILY A GLASS HAVING PER SE A DEGREE OF ALKALI-RESISTANCE SUCH THAT WHEN TESTED IN THE FORM OF AN ABRADED FIBRE OF LENGHT 2 1/2 INCHES AND DIAMETER OF FROM 0.4 TO 1.0 X 10-3 INCHES SAID FIBRE HAS A TENSILE STRENGTH OF AT LEAST 100,000 P.S.I. AFTER TREATMENT WITH SATURATED AQUEOUS CA(OH)2 SOLUTION AT 100*C FOR 4 HOURS FOLLOWED BY SUCCESSIVE WASHINGS AT AMBIENT TEMPERATURE WITH WATER, THEN WITH AQUEOUS HYDROCHLORIC ACID (1%) FOR 1 MINUTE, WATER, ACETONE, FOLLOWED BY DRYING, SAID FIBRE EXPERIENCING NOT MORE THAN 10% REDUCTION IN DIAMETER DURING SAID TEST.
Claim 2
Dependent Claim
135 words
A COMPOSITE FIBRE/CEMENTITIOUS PRODUCT COMPRISING FIBROUS MATERIAL DISTRIBUTED THROUGHOUT A CEMENT MATRIX AS A REINFORCING MATERIAL AND SUBJECT WHERE THE SURFACE IS EXPOSED TO THE CEMENT MATRIX, TO THE CORROSIVE ACTION OF SAID MATRIX, IN WHICH THE REINFORCING MATERIAL IS PRIMARILY A GLASS HAVING PER SE A DEGREE OF ALKALI-RESISTANCE SUCH THAT WHEN TESTED IN THE FORM OF AN ABRADED FIBRE OF LENGHT 2 1/2 INCHES AND DIAMETER OF FROM 0.4 TO 1.0 X 10-3 INCHES SAID FIBRE HAS A TENSILE STRENGTH OF AT LEAST 100,000 P.S.I. AFTER TREATMENT WITH SATURATED AQUEOUS CA(OH)2 SOLUTION AT 100*C FOR 4 HOURS FOLLOWED BY SUCCESSIVE WASHINGS AT AMBIENT TEMPERATURE WITH WATER, THEN WITH AQUEOUS HYDROCHLORIC ACID (1%) FOR 1 MINUTE, WATER, ACETONE, FOLLOWED BY DRYING, SAID FIBRE EXPERIENCING NOT MORE THAN 10% REDUCTION IN DIAMETER DURING SAID TEST.
Claim 3
Dependent Claim
136 words
A composite fibre/cementitious product comprising fibrous material distributed throughout a cement matrix as a reinforcing material and subject where the surface is exposed to the cement matrix, to the corrosive action of said matrix, in which the reinforcing material is primarily a glass having per se a degree of alkali-resistance such that when tested in the form of an abraded fibre of length 2 1/2 inches and diameter of from 0.4 to 1.0 X 10 3 inches said fibre has a tensile strength of at least 100,000 p.s.i. after treatment with saturated aqueous Ca(OH)2 solution at 100*C for 4 hours followed by successive washings at ambient temperature with water, then with aqueous hydrochloric acid (1%) for 1 minute, water, acetone, followed by drying, said fibre experiencing not more than 10% reduction in diameter during said test.
Claim 4
Dependent Claim
136 words
A composite fibre/cementitious product comprising fibrous material distributed throughout a cement matrix as a reinforcing material and subject where the surface is exposed to the cement matrix, to the corrosive action of said matrix, in which the reinforcing material is primarily a glass having per se a degree of alkali-resistance such that when tested in the form of an abraded fibre of length 2 1/2 inches and diameter of from 0.4 to 1.0 X 10 3 inches said fibre has a tensile strength of at least 100,000 p.s.i. after treatment with saturated aqueous Ca(OH)2 solution at 100*C for 4 hours followed by successive washings at ambient temperature with water, then with aqueous hydrochloric acid (1%) for 1 minute, water, acetone, followed by drying, said fibre experiencing not more than 10% reduction in diameter during said test.
Claim 5
Dependent Claim
14 words
A cementitious product according to claim 1, in which the cement is Portland cement.
Claim 6
Dependent Claim
25 words
A cementitious product according to claim 1, in which the glass reInforcement is provided by fibres of diameter 0.4 to 1.0 X 10 3 inches.
Claim 7
Dependent Claim
19 words
A cementitious product according to claim 3, in which the fibres have a length of up to 4 inches.
Claim 8
Dependent Claim
14 words
A cementitious product according to claim 1, in which the fibres are single filaments.
Claim 9
Dependent Claim
13 words
A cementitious product according to claim 1, being a pipe or roofing sheet.
Claim 10
Dependent Claim
25 words
A cementitious product according to claim 1, wherein the glass contains about 17.0% CaO, 11.5% Al2O3, 7.2% MgO, 54.5% SiO2 and 9.8% MnO, by weight.
Claim 11
Dependent Claim
23 words
A cementitious product according to claim 1, containing about 15% CaO, 15% Al2O3, 55% SiO2, 3% MgO, 6% TiO2, 6% MnO, by weight.
Claim 12
Dependent Claim
20 words
A cementitious product according to claim 1, wherein the glass contains up to 10% by weight of a fluxing agent.
Claim 13
Dependent Claim
13 words
A cementitious product according to claim 9, wherein the fluxing agent is CaF2.
Claim 14
Dependent Claim
24 words
A cementitious product according to claim 10, wherein the glass contains about 15% CaO, 21% Al2O3, 56% SiO2, 3% CaF2, 5% MgO, by weight.
Claim 15
Dependent Claim
20 words
A cementitious product according to claim 1, in which the glass is one capable of being drawn into continuous fibres.
Claim 16
Dependent Claim
21 words
A cementitious product according to claim 1, in which the glass is substantially boron-free glass and contains in percent by weight.
Claim 17
Dependent Claim
22 words
A cementitious product according to claim 13, wherein the glass contains about 19.0% CaO, 21% Al2O3, 55% SiO2, 5% MgO by weight.
Claim 18
Dependent Claim
24 words
A cementitious product according to claim 13, wherein the glass contains about 18.0% CaO, 17% Al2O3, 55% SiO2, 5% MgO, 5% MnO, by weight.
References Cited (Backward Citations)
US2425883A
Cited
US2509599A
Cited
US2738285A
Cited
US3062670A
Cited
US3354031A
Cited
US3783092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |