Influence of mechanical activation on the synthesis and hydraulic activity of calcium dialuminate
Influence of mechanical activation on the synthesis and hydraulic activity of calcium dialuminate
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DOI：
10.1016/j.ceramint.2005.04.017
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发表时间：
2006
影响因子：
5.2
通讯作者：
Sanjay Kumar;A. Bandopadhyay;T. C. Alex;Rakesh Kumar
中科院分区：
文献类型：
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作者：
Sanjay Kumar;A. Bandopadhyay;T. C. Alex;Rakesh Kumar
以氢氧化钙和氢氧化铝为原料，经机械活化后，合成了二铝酸钙（CA 2，CaO，AAl 2 O 3）粉体。球磨机用于机械活化。球磨10 min后，X射线衍射分析发现，新相对应于CAH 10。将活化的混合物在1000°C下煅烧以获得CA 2。采用XRD、DTA和抗压强度测试等方法研究了CA 2的水硬性。不同水化时间的CA 2的XRD分析表明，CAH 10-C2 AH 8-C3 AH 6的转化速度更快。机械活化CA 2在水化1 d后达到最大抗压强度，而常规CA 2在水化14 d后达到最大强度。水化阶段的更快转化和快速的早期强度发展给出了CA 2的水硬性活性增加的指示。
Calcium dialuminate (CA2, CCaO, AAl2O3) powders were synthesized from the mechanically activated mixture of calcium hydroxide and aluminium hydroxide. Attrition mill was used for the mechanical activation. A new X-ray phase corresponding to CAH10was identified after 10min of attrition milling. The activated mixture was calcined at 1000°C to obtain CA2. The hydraulic activity of the prepared CA2was studied using XRD, DTA and compressive strength development. The XRD analysis of CA2hydrated for different periods indicated the faster conversion of CAH10–C2AH8–C3AH6.In case of mechanically activated CA2,the maximum compressive strength was achieved after 1-day hydration, whereas in conventional CA2the maximum strength was obtained after 14-day hydration. The faster conversion of hydration phases and rapid early strength development gives an indication of increased hydraulic activity of CA2.