锌盐对水泥水化历程的影响  

Influence of Zinc Salts on Cement Hydration Process

作　　者：马保国[1] 张莉[2] 董荣珍[1] 张平均[1] 朱洪波[1] 钟开红[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [2]北京建工集团商品混凝土中心,北京100021

出　　处：《建筑材料学报》2004年第4期442-446,共5页Journal of Building Materials

基　　金：国家973重点基础研究发展规划项目(2001CB6107043)

摘　　要：通过研究ZnCl2,ZnSO4对水泥凝结时间、水化热、电阻率及抗压强度的影响,探讨了锌盐对水泥水化历程的影响及其缓凝机理.结果表明:随着ZnCl2掺量的增加,水泥水化放热速率降低,水泥水化与硬化延缓,电阻率发展变慢,水泥早期强度明显降低,但对28d抗压强度影响较小;当ZnSO4掺量为0.10%时,水泥终凝时间约提前50min,当掺量大于0.10%时,水泥水化放热速率降低,电阻率发展变慢,水泥水化历程延缓,但不影响抗压强度的发展;同掺量下,ZnCl2延缓水化的作用大于ZnSO4;锌盐对水泥水化历程的影响规律不仅与其掺量有关,还与其所含阴离子有关.In this paper the effects of ZnCl_2 and ZnSO_4 on setting time, heat of hydration, resistivity and compressive strength of cement were studied. Results show that with increasing amount of ZnCl_2, the hydration exothermic rate is lowered, hydration and hardening of cement is delayed, the resistivity development and the early strength are reduced, effect on 28 d compressive strength is slight. Moreover, with respect to ZnSO_4, when use level is 0.10%, cement final set was accelarated by 50 min. When use level is more than 0.10%, the hydration exothermic rate was lowered. And the resistivity is developed slowly. The cement hydration process is delayed. But strengths are not influenced. The retarding effect of ZnCl_2 is larger than that of ZnSO_4 with the same use level. The effect of zinc salts on cement hydration process not only has something to do with the mass of Zn^(2+), but also with their negative ion.

关 键 词：水泥水化 ZNCL2 锌盐 降低 缓凝机理 掺量 电阻率 抗压强度 水化热 早期强度 

分 类 号：TU528[建筑科学—建筑技术科学] TQ172[化学工程—水泥工业]