本文主要研究了水灰比、温度及外加剂掺量对预制梁混凝土凝结时间的影响。研究发现:随着水灰比或外加剂掺量的增加,预制梁混凝土凝结时间明显增长,w/c=0.31时相对w/c=0.27时终凝时间延长44%,外加剂掺量为1.5%时,相对延长45.5%;随着养护温度的提高,预制梁混凝土终凝时间明显缩短,30℃较10℃缩短约59.8%。 In this paper, the effects of water-cement ratio, temperature and admixture dosage on the setting time of precast concrete are studied. The results show that with the increase of water-cement ratio or admixture, the setting time of precast concrete obviously increases. When w / c = 0.31, the final setting time is 44% and the dosage of admixture is 1.5 %, The relative lengthening of 45.5%. With the increase of curing temperature, the final setting time of precast concrete is obviously shortened, and the shortening time of 30 ℃ is about 59.8% shorter than that of 10 ℃.