Effect of Alumina Doping on Structure and Reactivities of Alite with Multiple Foreign Ions
Effect of Alumina Doping on Structure and Reactivities of Alite with Multiple Foreign Ions
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发表时间：
2012
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通讯作者：
Ouyang Shixi
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作者：
Ouyang Shixi
研究了Al_2O_3掺杂对含Na、K等杂质的阿利特晶体结构、缺陷及水化行为的影响，用X射线粉末衍射Rietveld法、热释光和等温量热法研究了M3型阿利特的结构，结果表明，Al的三分之一可以取代Ca，三分之二可以取代Si，少量的Al_2O_3对M3型阿利特有稳定作用，M3型阿利特的晶格参数与Al_2O_3含量基本成线性关系，直到Al_2O_3含量为1%（质量分数），Al_2O_3的掺入使阿利特的非本征缺陷增多，影响了阿利特的热释光和水化动力学。阿利特的水化行为与缺陷的种类、缺陷的浓度无关。阿利特初始热释光强度的变化与其水化反应性相一致。这与作为俘获电子存储的亚稳态能量有关。
The effect of alumina(Al2O3) 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 Al could replace Ca,and two thirds of Al could replace Si.A small amount of Al2O3 was effective for M3-type alite stabilization,and the lattice parameters of the M3 polymorph with the content of Al2O3 was essentially linear,up to the limits of Al2O3 of 1%(in mass),which followed the Vegard's law.The incorporation of Al2O3 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.