Patent EP0304033A2 successfully refreshed from Google Patents.
US4090884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibitors for alkali-glass reactions in glass fiber reinforced cement products
Assignee: W R Bonsal Co
•
Filing: 1976-07-16
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Granted: 1978-05-23
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Expires: 1996-07-16
Abstract
Abstract A glass reinforced cement composition containing a scavenger material as an inhibitor to prevent or greatly reduce attack and degradation of the glass reinforcement by the alkali content of the inorganic alkaline cement binder. The scavenger is a finely divided alkali-reactive material which contains silica as the major constituent thereof, and which has a reactivity with the alkali content of the binder substantially greater than the reactivity of the glass reinforcement therewith whereby the alkali content of the binder reacts with the scavenger in preference to reacting with the glass reinforcement.
Inventors
- 👤 Friedrich Goeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:17
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; Y; Y10; Y10T; Y10T428/00; Y10T428/18; Y10T428/183
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A glass reinforced cement mix suitable for high tensile strength applications such as surface bonding of cement blocks or the like or in the formation of concrete articles and characterized by a resistance to alkali-glass reaction resulting in loss of tensile strength, said cement mix comprising: ______________________________________
Parts by weight
______________________________________
Portland cement 100
Hydrated lime 0-30
Alkali susceptible
E-glass reinforcement
elements 2-15
Aggregate filler 0-300
Inhibitor for alkali-
aggregate expansion
reaction, ASTM-C-441
0-15
Finely divided alkali
reactive scavenger
material containing
at least 65% SiO.sub.2 and
comprising 30-325 mesh
powdered soda lime glass
1-7
______________________________________ said scavenger material having a reactivity with the alkali content of said Portland cement which is substantially greater than the reactivity of said glass reinforcement elements therewith whereby the alkali content of said Portland cement reacts with said scavenger material in preference to said glass reinforcement element.
Claim 2
Dependent Claim
142 words
A glass reinforced cement mix suitable for high tensile strength applications such as surface bonding of cement blocks or the like or in the formation of concrete articles and characterized by a resistance to alkali-glass reaction resulting in loss of tensile strength, said cement mix comprising: ______________________________________
Parts by weight
______________________________________
Portland cement 100
Hydrated lime 0-30
Alkali susceptible
E-glass reinforcement
elements 2-15
Aggregate filler 0-300
Inhibitor for alkali-
aggregate expansion
reaction, ASTM-C-441
0-15
Finely divided alkali
reactive scavenger
material containing
at least 65% SiO.sub.2 and
comprising 30-325 mesh
powdered soda lime glass
1-7
______________________________________ said scavenger material having a reactivity with the alkali content of said Portland cement which is substantially greater than the reactivity of said glass reinforcement elements therewith whereby the alkali content of said Portland cement reacts with said scavenger material in preference to said glass reinforcement element.
Claim 3
Dependent Claim
92 words
A glass reinforced cement mix suitable for high tensile strength applications such as surface bonding of cement blocks or the like or in the formation of concrete articles and characterized by a resistance to alkali glass reaction resulting in loss of tensile strength, said cement mix comprising: ______________________________________
Parts by weight
______________________________________
Portland cement 100
Hydrated lime 13-22
Fine sand aggregate 100-160
1/2" chopped glass fiber reinforcement
4-7
30-325 mesh soda-lime glass
scavenger inhibitor .4-2
BaCl.sub.2 expansion inhibitor
.5-3
Set accelerating admixture
1-3
Water retaining admixture
.1-.4
Mineral oxide pigments 0-12
______________________________________
Claim 4
Dependent Claim
92 words
A glass reinforced cement mix suitable for high tensile strength applications such as surface bonding of cement blocks or the like or in the formation of concrete articles and characterized by a resistance to alkali glass reaction resulting in loss of tensile strength, said cement mix comprising: ______________________________________
Parts by weight
______________________________________
Portland cement 100
Hydrated lime 13-22
Fine sand aggregate 100-160
1/2" chopped glass fiber reinforcement
4-7
30-325 mesh soda-lime glass
scavenger inhibitor .4-2
BaCl.sub.2 expansion inhibitor
.5-3
Set accelerating admixture
1-3
Water retaining admixture
.1-.4
Mineral oxide pigments 0-12
______________________________________
Claim 5
Dependent Claim
185 words
A surface bonded wall comprising an assembly of stacked concrete blocks and a glass reinforced surface bonding cement coating applied over at least one surface of the assembly of stacked concrete blocks and serving to bond the blocks together without the necessity of mortar between the blocks, said surface bonding cement coating being characterized by a resistance to alkali degradation of the glass reinforcement resulting in loss of tensile strength, and said cement coating comprising an inorganic cementitious binder containing at least one reactive alkali compound, glass reinforcement, and a finely-divided alkali-reactive scavenger material, said scavenger material containing silica as the major constituent thereof and having a reactivity with the alkali content of said binder which is substantially greater than the reactivity of said glass reinforcement therewith whereby the alkali content of said binder reacts with said scavenger material in preference to the glass reinforcement to protect the glass reinforcement from degradation from the alkali content of the binder, and the amount of said scavenger material, based upon the silica content thereof, being at least in stochiometric proportion to the alkali content of said binder.
Claim 6
Dependent Claim
185 words
A surface bonded wall comprising an assembly of stacked concrete blocks and a glass reinforced surface bonding cement coating applied over at least one surface of the assembly of stacked concrete blocks and serving to bond the blocks together without the necessity of mortar between the blocks, said surface bonding cement coating being characterized by a resistance to alkali degradation of the glass reinforcement resulting in loss of tensile strength, and said cement coating comprising an inorganic cementitious binder containing at least one reactive alkali compound, glass reinforcement, and a finely-divided alkali-reactive scavenger material, said scavenger material containing silica as the major constituent thereof and having a reactivity with the alkali content of said binder which is substantially greater than the reactivity of said glass reinforcement therewith whereby the alkali content of said binder reacts with said scavenger material in preference to the glass reinforcement to protect the glass reinforcement from degradation from the alkali content of the binder, and the amount of said scavenger material, based upon the silica content thereof, being at least in stochiometric proportion to the alkali content of said binder.
References Cited (Backward Citations)
US3969567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |