標題: An NMR and XRD study of solidification/stabilization of chromium with portland cement and beta-C2S
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;chromium;solidification/stabilization;beta-C2S;cement
公開日期: 1-六月-1996
摘要: Solidificalion/stabilization of chromium with Portland cement Type I and P-dicalcium silicate (beta-C2S) was investigated by means of the Si-29 solid stale Magic Angle Spinning/Nuclear Magnetic Resonance (Si-29 MAS/NMR) and X-ray Diffraction (XRD) techniques. It is found that chromium nitrate can increase the extent of beta-C2S hydration. It is also confirmed that the chromium ion is easily incorporated into the beta-C2S paste and hydrated Portland cement, and that it affects the characteristics of hydration and hydration products. Formation of beta-calcium chromium oxide hydrate (beta-CaCrO4 . 2H2(O)) during the hydration of chromium-doped beta-C2S and calcium chromium oxide hydrate (CaCrO4 . 2H(2)O) during the hydration of chromium-doped Portland cement indicates the substitution of chromium for silicon in hydration products. The chromium ion, Cr3+, is thus stabilized and solidified through this mechanism.
URI: http://dx.doi.org/10.1016/0304-3894(95)00154-9
http://hdl.handle.net/11536/1239
ISSN: 0304-3894
DOI: 10.1016/0304-3894(95)00154-9
期刊: JOURNAL OF HAZARDOUS MATERIALS
Volume: 48
Issue: 1-3
起始頁: 137
結束頁: 147
顯示於類別:期刊論文


文件中的檔案:

  1. A1996UG82000009.pdf