三聚磷酸钠复合聚羧酸对C_3A-石膏水化历程影响  

Influence of Hydration Progress of C_3A-gypsum System Adulteration Sodium Tripolyphosphate and Polycarboxylic Copolymer

作　　者：马保国[1] 夏永芳[1] 谭洪波[1] 胡家兵[1] 肖君[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《武汉理工大学学报》2012年第11期1-5,共5页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展计划"973"(2009CB623201);国家自然科学基金(5118363)

摘　　要：以C3A-石膏为主体,探讨了掺加聚羧酸和聚羧酸与三聚磷酸钠协同作用对其水化历程的影响。采用水化微量热仪测定试样水化放热速率;用XRD定性分析测试不同水化龄期、不同体系的水化程度;以FT-IR分析试样中基团的振动状态从而判断其存在形式,以SEM观察水化产物形貌。结果表明掺聚羧酸后水化第一放热峰提前2h,且水化12h即有大量AFt生成,但是对后期水化具有一定的延缓作用;复掺三聚磷酸钠与聚羧酸时抑制了AFt的生成并延缓了AFt向AFm的转变,第一、第二放热峰均延迟了8h左右;单掺和复掺对后期结构发展影响均不大。The synergistic effect of sodium tripolyphosphate and polycarboxylic copolymer on the hydration process of C3 A-gypsum system was discussed in this study. Isothermal microcalorimetry was employed to obtain the hydration exo thermic rate curves, X-ray diffraction qualitative analysis was used to determine the hydration degree of samples, the vi bration state of the groups were analyzed by FI＇-IR analysis and SEM was used to observe the morphology of hydration products. The results show that the first exothermic peak arrived 2 h earlier and generated lots of AFt after 12 h when added polycarboxylic copolymer, while hydration of C3 A-gypsum system at late age was delayed; When both sodium tri polyphosphate and polycarboxylic copolymer were added together, the generationof AFt and the transformation from AFt to AFm were both delayed. The first and second exothermic peak both delayed about 8 h; but the structural development at late age was not influenced under both situations.

关 键 词：三聚磷酸钠 聚羧酸 水化程度 缓凝 

分 类 号：TU528.04[建筑科学—建筑技术科学]