Mineralogical characteristics of Ettringites synthesized from solutions and suspensions
Mineralogical characteristics of Ettringites synthesized from solutions and suspensions
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DOI：
10.1016/j.cemconres.2004.04.037
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发表时间：
2006-01-01
影响因子：
11.4
通讯作者：
Schwesig, P
中科院分区：
文献类型：
--
作者：
Goetz-Neunhoeffer, F;Neubauer, J;Schwesig, P
由于钙矾石（3CaO）具有广泛的技术重要性。氧化铝(。)3卡索(4)()。在水化水泥体系中，采用了四种不同的合成方法，以更好地了解钙矾石是如何形成的，以及在什么有利条件下形成的。第一步，建立了不同的沉淀方法得到钙矾石。在所有方法中，Al3+均由无co2的Al-2(SO4)(3)（水溶液）提供。18 h (2) O。作为草酸供应的来源是一种透明的溶液，否则使用Ca(OH)(2)-悬浮液。采用了含蔗糖和不含蔗糖的四种合成路线。考察了反应温度、反应时间、合成液ph值等参数的变化以及石膏添加量的影响。采用x射线衍射法（XRD）进行了定性物相分析。利用扫描电镜对合成产物的形貌进行了研究。最后利用rietveld法对xrd图进行细化，确定了ettringite的晶格和结构参数。(c) 2005 Elsevier Ltd版权所有。
Due to the wide technical importance of Ettringite (3CaO (.) Al2O3 (.) 3CaSO(4) (.) 32H(2)O) in hydrated cement based systems, four different synthesis methods were applied to get a better overview on how and under what favoring conditions Ettringite can be formed. In the first step different precipitation methods resulting in Ettringite were established. For all methods Al3+ was supplied by aqueous CO2-free solution of Al-2(SO4)(3) (.) 18H(2)O. As a source of CaO-supply a clear solution and otherwise a Ca(OH)(2)-suspension was utilized. Four synthesis routes with and without sucrose were employed.Variation of reaction parameter like temperature, time of reaction, pH-value of synthesis solution and influence of additional Gypsum were investigated. The qualitative phase analysis was performed by X-ray diffraction method (XRD). Morphological aspects of some synthesis products were studied by scanning electron microscopy (SEM). Finally lattice and structural parameter of the Ettringites were determined by refinement of XRD-pattern using the Rietveld-Method. (c) 2005 Elsevier Ltd. All rights reserved.