发明授权
- 专利标题： Method for retarding the setting time of rapid hardening cement
- 专利标题（中）： 延缓快速硬化水泥凝固时间的方法
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申请号： US444650申请日： 1974-02-21
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公开(公告)号： US3954489A公开(公告)日： 1976-05-04
- 发明人: Hiroshi Uchikawa , Hajime Kato
- 申请人： Hiroshi Uchikawa , Hajime Kato
- 申请人地址： JA Yamaguchi
- 专利权人： Onoda Cement Company, Ltd.
- 当前专利权人： Onoda Cement Company, Ltd.
- 当前专利权人地址： JA Yamaguchi
- 优先权： JA48-20266 19730221
- 主分类号： C04B22/06
- IPC分类号： C04B22/06 ; C04B7/345 ; C04B22/00 ; C04B22/08 ; C04B28/06 ; C04B7/02 ; C04B7/35
摘要：
This invention relates to a method for retarding the setting time of rapid hardening cement which comprises adding a boric compound to cement manufactured by adding insoluble anhydrite to clinker powder containing 11CaO.7Al.sub.2 O.sub.3.CaX.sub.2 or adding the clinker to insoluble anhydrite and intergrinding the mixture, and a method for still more retarding the setting time of rapid hardening cement which comprises adding a boric compound to cement containing a set-retarding agent other than the boric compound.
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