摘要
Hydration products and morphology characteristics of C3A （tricalcium aluminate）-CaCO3-H2O system were studied by means of XRD, DSC, FTIR spectrum analysis and SEM. The results indicate that, the new phases, i.e., C3A·0.5CaCO3·0.5Ca（OH）2·11.5H2O and C3A·CaCO3·11H2O are found in this system due to the activity of CaC03; the formation of C4AH13 and C2AH8 is prohibited and the generation of C3AH6 is delayed in the early hydration process. C3A·0.5CaCO3·0.5Ca（OH）2.11.5HEO is not stable and will be totally transferred within 24 h; C3A·CaCO3.11H2O exists stably once formation, and its flake-like crystalline phases in the early hydration transform to long rod shape, and to finally fine-needle at 28 d.
Hydration products and morphology characteristics of C3A(tricalcium aluminate) -CaCO3-H2O system were studied by means of XRD,DSC,FTIR spectrum analysis and SEM.The results indicate that,the new phases,i.e.,C3A·0.5CaCO3·0.5Ca(OH) 2· 11.5H2O and C3A·CaCO3·11H2O are found in this system due to the activity of CaCO3;the formation of C4AH13 and C2AH8 is prohibited and the generation of C3AH6 is delayed in the early hydration process.C3A·0.5CaCO3·0.5Ca(OH) 2·11.5H2O is not stable and will be totally transferred within 24 h;C3A·CaCO3·11H2O exists stably once formation,and its flake-like crystalline phases in the early hydration transform to long rod shape,and to finally fine-needle at 28 d.
基金
Project(50678177) supported by by the National Natural Science Foundation of China
