早强组分可缩短水泥凝结时间，但掺量不宜太大；
The accelerator can shorten the setting time, the dosage yet can not be too much.
研究了不同掺量、不同细度的几种粉煤灰对水泥凝结时间的影响。
The effect of several fly ash with different amount and fineness on the setting time of cement is studied.
上述外加剂对砂浆强度和水泥凝结时间的影响也是本研究的部分内容。
Effect of the above admixtures on strength of mortars and setting of cement paste were measured.
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