Analysis of cubic and orthorhombic C(3)A hydration in presence of gypsum and lime.

Analysis of cubic and orthorhombic C(3)A hydration in presence of gypsum and lime.
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DOI:
10.1007/s10853-009-3292-3
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发表时间:
2009
影响因子:
4.5
通讯作者:
Casanova, I.
Casanova, I.
中科院分区:
材料科学3区
文献类型:
--
作者:
Kirchheim, A. P.;Fernandez-Altable, V.;Monteiro, P. J. M.;Dal Molin, D. C. C.;Casanova, I.

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采用场发射扫描电子显微镜(FE-SEM)和X射线衍射(XRD)研究了立方(纯)和正交(Na掺杂)铝酸三钙(C3 A)和石膏在无石灰和有石灰存在下的水化过程中的微观结构变化和相发展。结果表明,当不添加石灰时,在每个C3 A多晶型物和石膏的水合中发生重要差异;正交C3 A与石膏的反应比立方相更快,形成更长的钙矾石针状物;然而,石灰的存在减缓了正交样品中钙矾石的形成。附加的流变测试表明,在这些水泥混合物的凝固时间的可能影响。
Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) have been used to study the microstructural changes and phase development that take place during the hydration of cubic (pure) and orthorhombic (Na-doped) tricalcium aluminate (C3A) and gypsum in the absence and presence of lime. The results demonstrate that important differences occur in the hydration of each C3A polymorph and gypsum when no lime is added; orthorhombic C3A reacts faster with gypsum than the cubic phase, forming longer ettringite needles; however, the presence of lime slows down the formation of ettringite in the orthorhombic sample. Additional rheometric tests showed the possible effects on the setting time in these cementitious mixes.
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发表时间: 2001-02-01
影响因子: 11.4
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