论文部分内容阅读
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。
With C3A-gypsum as the main body, the influence of the synergistic effect of polycarboxylic acid, polycarboxylic acid and sodium tripolyphosphate on the hydration process was discussed. Hydration calorimetry was used to measure the rate of hydration of samples. XRD was used to test the hydration degree of different hydration age and different systems. X-ray diffraction (XRD) was used to analyze the vibration state of the groups in FT-IR to judge its existence Form, SEM observation of hydration product morphology. The results showed that the first exothermic peak of hydration after the addition of polycarboxylic acid advanced 2h, and a large amount of AFt was formed after hydration for 12h, but it delayed the hydration for a long time. When complexed with sodium tripolyphosphate and polycarboxylic acid, The formation of AFt delayed the conversion of AFt to AFm. The first and second exothermic peaks were both delayed by about 8h. The effects of single doping and complex doping on the subsequent structure development were not significant.