多组分组合作用下Al_2O_3掺杂对阿利特结构及活性的影响

Effect of Alumina Doping on Structure and Reactivities of Alite with Multiple Foreign Ions

采用X射线衍射结合Rietveld方法、热释光及微量热分析,研究了在Na、K等熟料阿利特中常见固溶组分作用下,Al2O3掺杂对阿利特结构、缺陷及水化活性的影响。结果表明:约1/3Al取代Ca,2/3Al取代Si;少量Al2O3即可将阿利特稳定为M3型,且M3晶格常数随Al2O3含量增加呈线性变化,直至达到Al2O3固溶极限1%(质量分数),符合Vegard固溶体定律;Al2O3进入阿利特,形成杂质缺陷,使其热释光性及水化反应动力学特征随之发生显著变化,且缺陷类型对水化的影响比浓度的影响更为显著;阿利特原始热释光强度与其水化反应活性大小一致,这与阿利特中以俘获电子形式亚稳储藏的能量有关。

The effect of alumina （A1203） doping on the crystal structure, defects and hydration behavior of alite with some impurities like Na, K, etc., were investigated by X-ray powder diffraction with the Rietveld method, thermoluminescence and isothermal calo- rimetry. It was indicated that one third of A1 could replace Ca, and two thirds of A1 could replace Si. A small amount of A1203 was effective for M3-type alite stabilization, and the lattice parameters of the M3 polymorph with the content of AlzO3 was essentially linear, up to the limits of A1203 of 1% （in mass）, which followed the Vegard＇s law. The incorporation of A1203 resulted in the more extrinsic defects, affecting the thermoluminescence （TL） and hydration kinetics of alite. The hydration behavior of alite did not de- pend much on the concentrations of defects as the types of defects. The variation in the intensity of the original TL for alites was in accordance with their hydration reactivity for 3 days, which was related to the metastable energy stored as traped electrons.