US4134773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of accelerated hardening and strength-increasing of different cements
Assignee: Centralna Laboratoria Po Physiko-Chimicheska Mechanika Pri Ban
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Filing: 1977-10-03
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Granted: 1979-01-16
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Expires: 1997-10-03
Abstract
Abstract A method for accelerating the hardening and increasing the strength of cements, including cement pastes, cement-sand mortars and concretes, which comprises mixing the cements with water plus an admixture at a temperature up to 60 DEG C., and thereafter allowing the mixture to harden at a temperature up to 100 DEG C. The admixture used comprises bialuminium pentahydroxychloride, gypsum, lime and alkali or alkaline earth nitrite.
Inventors
- 👤 Yordan T. Simeonov
- 👤 Nikola B. Djabarov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:24
CPC Classifications
C; C04; C04B; C04B22/00; C04B22/08; C04B22/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A method for accelerating the hardening and increasing the strength of cements which comprises admixing 100 parts by weight of the cements with water and an admixture comprising from 0.5 to 5 parts by weight of bialuminium pentahydroxychloride, 1 to 12 parts by weight of gypsum, 0.5 to 20 parts by weight of lime and up to 3 parts by weight of an alkali metal or an alkaline earth metal nitrite, at a temperature up to 60° C., and thereafter allowing the mixture to harden at a temperature up to 100° C.
Claim 2
Independent Claim
92 words
A method for accelerating the hardening and increasing the strength of cements which comprises admixing 100 parts by weight of the cements with water and an admixture comprising from 0.5 to 5 parts by weight of bialuminium pentahydroxychloride, 1 to 12 parts by weight of gypsum, 0.5 to 20 parts by weight of lime and up to 3 parts by weight of an alkali metal or an alkaline earth metal nitrite, at a temperature up to 60° C., and thereafter allowing the mixture to harden at a temperature up to 100° C.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the admixture is initially mixed with the cement and thereafter mixed with water.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein the admixture is initially mixed with water, and thereafter mixed with cement.
Claim 5
Dependent Claim
20 words
A method according to claim 1 wherein the admixture is mixed with 100 parts by weight of rapid hardening cement.
Claim 6
Dependent Claim
18 words
A method according to claim 1 wherein the admixture is mixed with 100 parts by weight of slag-cement.
Claim 7
Dependent Claim
18 words
A method according to claim 1 wherein the admixture is mixed with 100 parts by weight of pozzdana-cement.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein the admixture is mixed with 100 parts by weight of belite-cement.
References Cited (Backward Citations)
US1006725A
Cited
US1782471A
Cited
US3210207A
Cited
US3329517A
Cited
US3427175A
Cited
US3801338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |