论文部分内容阅读
研究了C3A-CaCO3-H2O三元体系的水化性能。采用量热分析进行C3A-CaCO3-H2O三元体系水化历程的研究;运用X射线衍射分析(XRD)进行物相检测。结果表明:CaCO3的掺入使C3A的水化历程发生了改变,导致其水化放热出现了有别于纯C3A水化放热规律的“双峰”现象,第一放热峰是由C3A初始水解以及生成碳铝酸钙水化物而产生的,与纯C3A的放热峰相比,峰值增高且峰值出现时间提前。第二放热峰是形成了大量的碳铝酸钙水化物而产生的。CaCO3与C3A反应形成了新相单碳铝酸钙水化物,水化1 h时有半碳铝酸钙和单碳铝酸钙水化物形成,水化1 d后产物中未发现半碳铝酸钙,只有单碳铝酸钙水化物存在直至28 d,说明半碳铝酸钙是不稳定的,而单碳铝酸钙是稳定的水化产物。
The hydration performance of C3A-CaCO3-H2O ternary system was studied. The calorimetric analysis was used to study the hydration process of C3A-CaCO3-H2O ternary system. The phase was detected by X-ray diffraction (XRD). The results show that the incorporation of CaCO3 changes the hydration process of C3A, resulting in the phenomenon of “double peak” which is different from the hydration exothermic pattern of pure C3A. The first exothermic peak is Produced by the initial hydrolysis of C3A and the formation of carbonic acid calcium aluminate hydrate, compared with the pure C3A exothermic peak, the peak is higher and the peak appears earlier. The second exothermic peak results from the formation of large amounts of calcium carbonaluminate hydrate. The reaction of CaCO3 with C3A formed a new phase of calcium monoaluminate hydrate. When hydrated for 1 h, half-calcium aluminate and mono-calcium aluminate hydrate were formed. Hydrochlorination did not find the half-carbonic acid Calcium, only calcium monoaluminate hydrate was present for up to 28 days, indicating that the half-calcium aluminate was unstable and that the mono-calcium aluminate was a stable hydration product.