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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 
单位:武汉工业大学 中国建筑材料科学研究院 
关键词:硅酸三钙 光电子能谱 水化 水化硅酸钙凝胶 
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.
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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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