水泥和缓凝剂对混凝土凝结时间的影响——兼论预拌混凝土的超缓凝及其预防

Effect of cement and set retarder on setting time of concrete——extra retarded set and its prevention of premixed concrete

讨论了水泥和缓凝剂(或缓凝减水剂)对混凝土凝结时间的影响。水泥凝结时间长则混凝土的凝结时间长,掺缓凝剂(或缓凝减水剂)后凝结时间更长,掺量越大凝结时间越长。预拌混凝土产生超缓凝的主要原因在于水泥的凝结时间过长和(或)缓凝剂(或缓凝减水剂)掺量过大。环境温度低也可能使混凝土超缓凝。

Effect of cement and set retarder(or set retarding and water-reducing admixture)on setting time of concrete was disaussed. The setting time of concrete extended as that of cement did, it also extended when the concrete blended set retarder. The phenomenon of extra retarded set of premixed concrete based on the reasons that the setting time of cement was too long and(or) the addition of set retarder was more than requirement or the circumstance temperature was low.