硅酸盐学报

C_3S在NaOH和水中早期水化的ESCA研究

作者：龙世宗刘晨邬燕蓉

分类号：TQ172.1

出版年,卷(期):页码：1998,26(4):0-0

DOI：

摘要：

用ＥＳＣＡ研究了Ｃ３Ｓ在水中和ＮａＯＨ溶液中水化１—１０ｍｉｎ试样的表面组成；用等离子发射光谱仪测定了Ｃ３Ｓ早期水化液相中的组成．结果表明：Ｃ３Ｓ早期水化表面组成ｎ（Ｃａ）／ｎ（Ｓｉ）＞３，或ｎ（Ｃａ＋Ｎａ）／ｎ（Ｓｉ）＞３，形成一富Ｃａ层．初步认为Ｃ３Ｓ在ＮａＯＨ溶液中水化，Ｃａ２＋溶出受阻而Ｓｉ４＋溶出加快；Ｎａ＋在水化早期进入双电层和表面组成中．实验表明，欲采用ＥＳＣＡ技术测定Ｃ３Ｓ早期水化生成的ＣＳＨ组成，必须预先将表面富Ｃａ层蚀刻去；而要准确做到这一点，还要解决许多技术问题．

The surface compositions of C 3S samples, which had been hydrated in NaOH solution or pure water for 1min to 10min, were studied by ESCA(electron spectroscopy for chemical analysis). The corresponding liquid phases of early hydrated C 3S were studied by IPE(inductively plasma emission). The results were considerable different from previous results concerning the mechanism of the early hydration of C 3S. n (Ca)/ n (Si) on early hydratied C 3S surface are higher than 3, and those in NaOH solution are n (Ca+Na)/ n (Si)>3. This result is considered by the authors that it should be related to electrical double layer forming on the solid-liquid interface, and also related to Ca 2+ brought out by capillary water while dehydrating in vacuum. if CSH is studied by ESCA, then calcium-rich layer must be removed beforehand.

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参考文献：

1MenetrierD，JawedI，SunTS，etal．ESCAandSEMstudiesonearlyC3Shydration．CementandConcreteResearch，1979（4）：4732BarnesP．StructureandPerformanceofCements，Vol1．London：AppliedSciencePublishers，1983：2453BarnesP．StructureandPerformanceofCement，Vol1．London：AppliedSciencePublishers，1983：248－252

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