C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/58
C04B 22/04 (2006.01) C04B 22/00 (2006.01) C04B 28/02 (2006.01)
Patent
CA 2027569
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?2Na2O?5A?2O3, Na2SO4 and Na2O?A?2O3. Alternatively, a predetermine ratio of 3CaO?2Na2O?5A?2O3, Na2SO4 and 4CaO?3A?2O3?SO3 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.
Hosoda Hatsutoshi
Kikuchi Masatsune
Kouda Susumu
Omori Hiroshi
Onoda Cement Co. Ltd.
Ridout & Maybee Llp
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