標題: An NMR, XRD and EDS study of solidification/stabilization of chromium with portland cement and C3S
作者: Lin, CK
Chen, JN
Lin, CC
環境工程研究所
材料科學與工程學系
Institute of Environmental Engineering
Department of Materials Science and Engineering
關鍵字: NMR;XRD;EDS;chromium;solidification/stabilization;C3S;cement
公開日期: 1-九月-1997
摘要: Solidification/stabilization (S/S) of chromium with Portland cement type I and tricalcium silicate (C3S) was investigated by using the Si-29 solid state magic angle spinning/nuclear magnetic resonance (Si-29 MAS/NMR), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The present study confirms that chromium nitrate can increase the extent of C3S hydration. It also confirms that the chromium ion is easily incorporated into the C3S paste and hydrated Portland cement, and that it affects the characteristics of the hydration processes and their hydration products, The formation of calcium chromium silicate (CaCrSi4O10), calcium chromium oxide hydrate (CaCrO4 . 2H(2)O), and calcium dichromate (CaCr2O7) during the hydration of chromium-doped C3S indicates the probable substitution of chromium for silicon in the calcium silicate hydrate (C-S-H) and the interaction between Cr and Si. Furthermore, formation of CaCrSi4O10, aluminum chromium oxide hydroxide hydrate (Al(OH)CrO4 . H2O), aluminum chromium oxide hydroxide (Al-2(OH)(4)CrO4), and CaCr2O7 during the hydration of chromium-doped cement reveals not only the probable substitution of chromium for silicon in the calcium silicate hydrate (C-S-H) but also the interaction among Cr, Si and Al, Apparently, the chromium iron (Cr3+) may also be stabilized and solidified through these mechanisms in addition to those proposed by other investigators. (C) 1997 Elsevier Science B.V.
URI: http://dx.doi.org/10.1016/S0304-3894(97)00032-0
http://hdl.handle.net/11536/326
ISSN: 0304-3894
DOI: 10.1016/S0304-3894(97)00032-0
期刊: JOURNAL OF HAZARDOUS MATERIALS
Volume: 56
Issue: 1-2
起始頁: 21
結束頁: 34
顯示於類別:期刊論文


文件中的檔案:

  1. A1997YG90700002.pdf