Patent US4409030A successfully refreshed from Google Patents.
US4409030A
Expired / Lapsed
US
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Material for destroying concrete structures
Assignee: Taiheiyo Cement Corp
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Filing: 1982-02-05
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Granted: 1983-10-11
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Expires: 2002-02-05
Abstract
Abstract A material for destroying concrete structures, rock formations and the like comprises a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns, and 20 to 80 parts by weight of cement. The cement may contain calcium sulfoaluminate as a hydraulic component, and a retardant may be added to the mixture to retard the hydration of the calcium sulfoaluminate. The material is blended with water and then injected into holes formed in the body to be destroyed, the material expanding as it hydrates to crack and fracture the body.
Inventors
- 👤 Keiichi Minegishi
- 👤 Tokuji Akiba
- 👤 Hiroshi Harada
- 👤 Akihiko Takei
- 👤 Motoshi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:35
CPC Classifications
E; E21; E21C; E21C37/00; E21C37/06; E21C37/12; C; C04; C04B; C04B28/00; C04B28/02; C04B28/10; C04B41/00; C04B41/0009; E04; E04G; E04G23/00; E04G23/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A destructive material comprising a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass having a crystal size of 1-5 microns, said quicklime mass being obtained by calcination of limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement.
Claim 2
Dependent Claim
66 words
A destructive material comprising a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass having a crystal size of 1-5 microns, said quicklime mass being obtained by calcination of limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement.
Claim 3
Dependent Claim
69 words
A destructive material according to claim 1, comprising a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass obtained by calcining limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement containing an effective amount of calcium sulfoaluminate as a hydraulic component.
Claim 4
Dependent Claim
84 words
A destructive material according to claim 1, comprising a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass obtained by calcining limestone at a temperature of from 1200° to 1500° C., 20 to 80 parts by weight of rapid-hardening cement containing an effective amount of calcium sulfoaluminate as a hydraulic component, and a suitable amount of a retardant for retarding the hydration of said calcium sulfoaluminate.
Claim 5
Dependent Claim
25 words
The destructive material according to claim 1, wherein said destructive material contains particles of quicklime having a particle size of from 500 to 1000 microns.
Claim 6
Dependent Claim
25 words
The destructive material according to claim 2, wherein said destructive material contains particles of quicklime having a particle size of from 500 to 1000 microns.
Claim 7
Dependent Claim
68 words
A destructive material consisting essentially of a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass having a crystal size of 1-5 microns, said quicklime mass being obtained by calcination of limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement.
Claim 8
Dependent Claim
68 words
A destructive material consisting essentially of a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass having a crystal size of 1-5 microns, said quicklime mass being obtained by calcination of limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement.
Claim 9
Dependent Claim
71 words
A destructive material according to claim 1, consisting essentially of a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass obtained by calcining limestone at a temperature of from 1200° to 1500° C., and 20 to 80 parts by weight of cement containing an effective amount of calcium sulfoaluminate as a hydraulic component.
Claim 10
Dependent Claim
86 words
A destructive material according to claim 1, consisting essentially of a mixture of 20 to 80 parts by weight of coarse-grained quicklime adjusted to a particle size of from 88 to 3000 microns by pulverizing a quicklime mass obtained by calcining limestone at a temperature of from 1200° to 1500° C., 20 to 80 parts by weight of rapid-hardening cement containing an effective amount of calcium sulfoaluminate as a hydraulic component, and a suitable amount of a retardant for retarding the hydration of said calcium sulfoaluminate.
Claim 11
Dependent Claim
25 words
The destructive material according to claim 6, wherein said destructive material contains particles of quicklime having a particle size of from 500 to 1000 microns.
Claim 12
Dependent Claim
25 words
The destructive material according to claim 7, wherein said destructive material contains particles of quicklime having a particle size of from 500 to 1000 microns.
Claim 13
Dependent Claim
25 words
The destructive material according to claim 8, wherein said destructive material contains particles of quicklime having a particle size of from 500 to 1000 microns.
Claim 14
Dependent Claim
31 words
The destructive material according to claim 1, wherein said destructive material is capable of developing expansive pressures of 300 kgf/cm 2 in no longer than 30 hours after mixing with water.
Claim 15
Dependent Claim
27 words
The destructive material according to claim 2, wherein said destructive material is capable of developing expansive pressures of 300 kgf/cm 2 in within 18 hours of injection.
Claim 16
Dependent Claim
20 words
The destructive material according to claim 6, wherein said cement is a calcium sulfoaluminate-type cement containing about 30% calcium sulfoaluminate.
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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |