初凝时间是指从水泥加水到开始失去塑性的时间。凝结时间的快慢,对施工方法和工程进度有很大的影响,所以要进行凝结时间的测定,以检验其是否满足混凝土施工所提出的要求。不同缓凝剂、配合比、外界温度会改变水泥的初凝时间。
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 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.
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 initial setting time of Portland cement shall not be earlier than 45 minutes, final set time not later than 390 minutes.
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。
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.
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