US4455171A
Expired / Lapsed
US
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Reactivatable set-inhibited cementitious compositions
Assignee: Societe dExplosifs et Produits Chimiques SA
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Filing: 1982-12-06
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Granted: 1984-06-19
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Expires: 2002-12-06
Abstract
Abstract Aqueous grouting compositions based on high alumina cement have the onset of setting delayed for upwards of one month by the incorporation therein of a set-inhibiting agent such as boric acid or gluconic acid delta lactone and can then be rapidly reactivated for use by the incorporation therein of a reactivator, for example lithium carbonate, to produce a high strength hardened cementitious composition. The reactivated composition can advantageously be used to anchor a reinforcing element such as a rockbolt or dowel in a borehole and for this purpose the set-inhibited cementitious composition and the reactivator can be packaged in the separate compartments respectively of a dual-compartment frangible cartridge.
Inventors
- 👤 Robert H. Spensley
- 👤 John Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:40
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/02; C09K17/10; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C09K17/40; C09K17/42; C09K17/44; C09K8/00; C09K8/42; C09K8/46; E; E21; E21D; E21D20/00; E21D20/02; E21D20/021; E21D20/023; C04B2111/00; C04B2111/00474; C04B2111/00715; F; F16; F16B; F16B13/00; F16B13/14; F16B13/141; F16B13/143
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A method of producing a hardened high alumina cement grouting composition which comprises forming a set- inhibited aqueous high alumina cement grouting composition essentially comprising high alumina cement, water and a set-inhibiting agent selected from boric acid and gluconic acid delta lactone, and thereafter, when the grouting composition is required for use, incorporating in the set- inhibited aqueous high alumina cement grouting composition a reactivator composition comprising a reactivator which will cause the grouting composition to set rapidly to a high strength hardened cementitious composition.
Claim 2
Independent Claim
85 words
A method of producing a hardened high alumina cement grouting composition which comprises forming a set- inhibited aqueous high alumina cement grouting composition essentially comprising high alumina cement, water and a set-inhibiting agent selected from boric acid and gluconic acid delta lactone, and thereafter, when the grouting composition is required for use, incorporating in the set- inhibited aqueous high alumina cement grouting composition a reactivator composition comprising a reactivator which will cause the grouting composition to set rapidly to a high strength hardened cementitious composition.
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein the set-inhibiting agent is present in the set-inhibited composition in an amount of from 0.01 to 5 percent by weight, based on the weight of high alumina cement.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein the reactivator composition contains lithium hydroxide, lithium carbonate, sodium silicate or calcium hydroxide.
Claim 5
Dependent Claim
29 words
A method according to claim 1, wherein the reactivator is employed in an amount of from 0.1 to 10% by weight, based on the weight of high alumina cement.
Claim 6
Dependent Claim
35 words
A method according to claim 1, wherein the set-inhibited composition and the reactivator composition are mixed together within a borehole drilled in a rock formation to provide a hardened cementitious grouting composition in the borehole.
Claim 7
Dependent Claim
23 words
A method according to claim 5, wherein the hardened grouting composition serves to anchor a reinforcing member which is inserted into the borehole.
Claim 8
Dependent Claim
26 words
A method according to claim 6, wherein the set-inhibited composition and the reactivator composition are provided as separate components contained in a dual- compartment frangible cartridge.
Claim 9
Dependent Claim
28 words
A method according to claim 1, wherein the set-inhibited composition and the reactivator composition are mixed together before being injected into a borehole drilled in a rock formation.
Claim 10
Dependent Claim
99 words
A dual-compartment frangible cartridge suitable for use in the anchoring of a reinforcing member in a borehole drilled in a rock formation, there being present in one compartment of the cartridge a set- inhibited aqueous high alumina cement grouting composition comprising high alumina cement, water and a set-inhibiting agent selected from boric acid and gluconic acid delta lactone, and in the other compartment a reactivator composition comprising a reactivator capable of causing the grouting composition to set rapidly to a high strength hardened cementitious composition when in use the reactivator composition is brought into contact with the set-inhibited composition.
Claim 11
Dependent Claim
99 words
A dual-compartment frangible cartridge suitable for use in the anchoring of a reinforcing member in a borehole drilled in a rock formation, there being present in one compartment of the cartridge a set- inhibited aqueous high alumina cement grouting composition comprising high alumina cement, water and a set-inhibiting agent selected from boric acid and gluconic acid delta lactone, and in the other compartment a reactivator composition comprising a reactivator capable of causing the grouting composition to set rapidly to a high strength hardened cementitious composition when in use the reactivator composition is brought into contact with the set-inhibited composition.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |