The initial setting time of Portland cement shall not be earlier than 45 minutes, final set time not later than 390 minutes.
硅酸盐水泥的初凝时间不得早于45分钟，终凝时间不得迟于390分钟。
The results show that, with the in- crease in CA cement content, the fluidity of MgO-based investment materials decreases and so does the initial setting time.
结果表明，随着铝酸钙水泥含量的增加，氧化镁系包埋料的初凝时间缩短，流动性变差；
The invention provides a cement product setting accelerating method which can shorten the initial setting time of the cement product and enhance the production efficiency.
本发明提供一种缩短水泥制品初凝时间，提高生产效率的水泥制品促凝方法。
To improve the accuracy and reduce the setting time for the initial alignment of marine attitude heading reference system(AHRS) under motion, a method of two-position alignment was presented.
为提高船用航姿系统的对准精度和对准速度，提出了摇摆条件下的两位置对准方案。
The results show: (1) with high calcium mixing, concrete workability was modified, the water quantity needed for standard consistence decreased, initial and final setting time increased;
结果表明：（1）高钙灰的掺入改善了胶砂的工作性，降低了标准稠度用水量，延缓了胶材的初终凝时间；
The results show: (1) with high calcium mixing, concrete workability was modified, the water quantity needed for standard consistence decreased, initial and final setting time increased;
结果表明：（1）高钙灰的掺入改善了胶砂的工作性，降低了标准稠度用水量，延缓了胶材的初终凝时间；
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