凝结时间分为初凝时间和终凝时间。初凝时间为水泥加水拌合起，至水泥浆开始失去塑性所需的时间。终凝时间从水泥加水拌合起，至水泥浆完全失去塑性并开始产生强度所需的时间。水泥凝结时间在施工中有重要意义，初凝时间不宜过短，终凝时间不宜过长。硅酸盐水泥初凝时间不得早于45min，终凝时间不得迟于390min；普通水泥初凝时间不得早于45min，终凝时间不得迟于600min。水泥初凝时间不合要求，该水泥报废；终凝时间不合要求，视为不合格。
施工完毕后，希望水泥能尽快硬化，产生强度，所以终凝时间不宜太长。
After the completion of the engineering project, the hope cement hardening, as soon as possible to produce strength, so the final setting time shoulds not be too long.
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.
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;
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