§
Luxuse
Patent Intelligence
Sign In
Patent US5160376A successfully refreshed from Google Patents.
← Back to Patent Explorer
US5160376A Expired / Lapsed US ⏱️ 0.0 years remaining

Cement setting accelerator and method of manufacturing the same

Assignee: Taiheiyo Cement Corp
•
Filing: 1990-03-28
•
Granted: 1992-11-03
•
Expires: 2010-03-28
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The present invention provides a cement setting accelerator comprising 100 parts by weight of a sintered body, 5 to 70 parts by weight of an alkali metal carbonate powder and at most 170 parts by weight of a lime powder and a method of manufacturing the same. The sintered body contains a predetermined ratio of 3CaO.2Na 2 O.5Al 2 O 3 , Na 2 SO 4 and Na 2 O.Al 2 O 3 . Alternatively, a predetermined ratio of 3CaO.2Na 2 O.5Al 2 O 3 , Na 2 SO 4 and 4CaO.3Al 2 O 3 .SO 3 are contained in the sintered body. Further, a raw material mixture, which is not sintered and equal in the chemical composition to the sintered body noted above, may be used in place of the sintered body. Setting and hardening of a cement paste is markedly promoted by adding a small amount of the cement setting accelerator of the present invention to the cement paste. Also, the initial setting time of the cement paste can be controlled by controlling the amount of addition of the cement setting accelerator of the present invention.

Inventors

  • 👤 Masatsune Kikuchi
  • 👤 Hiroshi Omori
  • 👤 Hatsutoshi Hosoda
  • 👤 Susumu Kouda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 02:36
CPC Classifications
C; C04; C04B; C04B22/00; C04B22/06; C04B40/00; C04B40/0028; C04B40/0039; C04B22/0093; C04B28/00; C04B28/02; C04B2103/00; C04B2103/10; C04B2103/14

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 121 words
A cement setting accelerator, comprising: 100 parts by weight of a sintered powdery material prepared by pulverizing a sintered body containing 4.25 to 85% of 3CaO.2Na 2 O.5Al 2 O 3 , 0.75 to 15% of Na 2 SO 4 , and at most 95% of Na 2 O.Al 2 O 3 , said sintered body being obtained by sintering at 1150° C. or more a raw material containing 19.7 to 36.9% of Na 2 O, 54.0 to 61.8% of Al 2 O 3 , 0.9 to 17.8% of CaO, and 0.4 to 9.5% of SO 3 ; 5 to 70 parts by weight of an alkali metal carbonate powder; and at most 170 parts by weight of a lime powder.
Claim 2
Dependent Claim 121 words
A cement setting accelerator, comprising: 100 parts by weight of a sintered powdery material prepared by pulverizing a sintered body containing 4.25 to 85% of 3CaO.2Na 2 O.5Al 2 O 3 , 0.75 to 15% of Na 2 SO 4 , and at most 95% of Na 2 O.Al 2 O 3 , said sintered body being obtained by sintering at 1150° C. or more a raw material containing 19.7 to 36.9% of Na 2 O, 54.0 to 61.8% of Al 2 O 3 , 0.9 to 17.8% of CaO, and 0.4 to 9.5% of SO 3 ; 5 to 70 parts by weight of an alkali metal carbonate powder; and at most 170 parts by weight of a lime powder.
Claim 3
Dependent Claim 121 words
A cement setting accelerator, comprising: 100 parts by weight of a sintered powdery material prepared by pulverizing a sintered body containing 0.85 to 84.15% of 3CaO.2Na 2 O.5Al 2 O 3 , 0.15 to 14.85% of Na 2 SO 4 , and 1 to 99% of 4CaO.3Al 2 O 3 .SO 3 , said sintered body being obtained by sintering at 1150° C. or more a raw material containing 0.2 to 19.5% of Na 2 O, 50.2 to 54.0% of Al 2 O 3 , 18.0 to 36.5% of CaO, and 8.5 to 13.1% of SO 3 ; 5 to 70 parts by weight of an alkali metal carbonate powder; and at most 170 parts by weight of a lime powder.
Claim 4
Dependent Claim 121 words
A cement setting accelerator, comprising: 100 parts by weight of a sintered powdery material prepared by pulverizing a sintered body containing 0.85 to 84.15% of 3CaO.2Na 2 O.5Al 2 O 3 , 0.15 to 14.85% of Na 2 SO 4 , and 1 to 99% of 4CaO.3Al 2 O 3 .SO 3 , said sintered body being obtained by sintering at 1150° C. or more a raw material containing 0.2 to 19.5% of Na 2 O, 50.2 to 54.0% of Al 2 O 3 , 18.0 to 36.5% of CaO, and 8.5 to 13.1% of SO 3 ; 5 to 70 parts by weight of an alkali metal carbonate powder; and at most 170 parts by weight of a lime powder.

References Cited (Backward Citations)

US4650523A Cited
US4798628A Cited
JPS63206341A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-11-03 1996-05-04 1996-11-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-11-03 2000-05-04 2000-11-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-11-03 2004-05-04 2004-11-03 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag