C3S在NaOH和水中早期水化的ESCA研究

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，Ｃａ＾３＋溶出受阻而Ｓｉ＾４＋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

ESCA STUDY ON EARLY HYDRATION OF C3S IN NaOH SOLUTION AND PURE WATER

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.