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研究了C3A-CaSO4·2H2O-CaCO3-H2O体系水化性能,通过X-射线衍射仪、差热分析仪对该体系进行了物相分析,采用量热试验对其水化历程进行了分析.结果表明:CaCO3的引入阻碍了反应产物AFt向AFm转化,提高了AFt的稳定性;CaCO3提供的CO23-导致AFm向单碳铝酸盐转化,而该转化重新提供的SO24-又促进AFm向AFt转化,从而使AFm不稳定;掺入12.5%(质量分数)CaCO3和12.5%(质量分数)CaSO4.2H2O后,C3A-CaSO4·2H2O-CaCO3-H2O体系放热峰较纯C3A体系放热峰增强、前移,其峰值及峰值出现的时间介于纯C3A和单掺25%CaCO3体系之间,第1放热峰为C3A初始水解和AFt形成所致,第2放热峰为AFt向AFm转化以及碳铝酸盐水化物形成所致,第3放热峰为碳铝酸盐水化物大量形成所致.
The hydration behavior of C3A-CaSO4 · 2H2O-CaCO3-H2O system was studied and the phase analysis of the system was carried out by X-ray diffractometer and differential thermal analyzer. The hydration course of C3A-CaSO4 · 2H2O- The results showed that the introduction of CaCO3 hindered the conversion of AFt to AFm and improved the stability of AFt. The CO23- provided by CaCO3 led to the conversion of AFm to monocarboxaluminate, and the SO24- re-supplied by this conversion promoted the transformation of AFm to AFt , Which makes the AFm unstable. Compared with the pure C3A system, the exothermic peak of C3A-CaSO4 · 2H2O-CaCO3-H2O system is enhanced after the incorporation of 12.5% (mass fraction) CaCO3 and 12.5% (mass fraction) The peak and peak appeared between the pure C3A and the single doped 25% CaCO3 system. The first exothermic peak was caused by the initial hydrolysis of C3A and the formation of AFt. The second exothermic peak was the transformation from AFt to AFm and Due to the formation of carbowax hydrate, the third exothermic peak is due to the massive formation of carbowax hydrate.