聚羧酸减水剂对不同晶型C_3S早期水化放热的影响  

Effect of Superplasticizer on Early Hydration Property of Different Tricalcium Silicate Polymorphs

作　　者：谭立心[1,2] 罗超云[2] 弓子成[3] 黄修林[4] 丁庆军[3] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410015 [2]广东省长大公路工程有限公司,广州511430 [3]武汉理工大学材料科学与工程学院,武汉430070 [4]湖北大学材料科学与工程学院,武汉430062

出　　处：《武汉理工大学学报》2012年第6期10-16,共7页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展计划(973计划)(2009CB623201)

摘　　要：采用水化微量热仪研究了不同类型聚羧酸减水剂对不同晶型C3S水化放热特性的影响。结果表明:单斜晶系(M)C3S、三方晶系(R)C3S的水化放热速率峰值相比三斜晶系(T)C3S显著降低,且水化放热峰出现延迟,MC3S的水化放热峰延迟最明显。三种晶型C3S的3d水化放热总量由大到小为:TC3S、MC3S、RC3S。不同分子结构的甲氧基聚乙二醇甲基丙烯酸酯系聚羧酸减水剂,主链越短,支链越长,对TC3S的水化延迟作用越大。乙烯基聚乙二醇醚系聚羧酸减水剂对三种晶型C3S的水化放热过程延迟作用由大到小为:RC3S、MC3S、TC3S。对水化放热曲线进行的Krstulovic-Dabic模型研究表明,C3S的水化过程为NG-D类型水化历程。Effect of superplasticizer on hydration exothermic of different tricalcium silicate polymorphs has been stud- ied in this paper by using Isothermal Calorimetry. The results show that MC3 S, RCs S hydration heat release rate peak was significantly lower than TC3 S, and the heat of hydration of MC3 S especially delays. The 3 d total of hydration heat release of three C3 S poiymorphs as follow： TC3 S, MC3 S, RC3 S. The shorter of main chain length or the longer of branch chains length in methoxy polyethylene glycol-methacrylates-based polycarboxylate molecule, the stronger of the delay in TCz S hydration within 3 days. When samples doped with vinyLpoly （ethylene glycol）-based polycarboxylate superplasticizer, the hydration exothermic of different tricalcium silicate polymorphs delays to a certain extent, The most obvious is RC3 S. The study of Krstulovic-Dabic model shows that the dynamics process of Ca S is the NG-D type.

关 键 词：聚羧酸减水剂 C3S 水化放热 

分 类 号：TQ172.1[化学工程—水泥工业]