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Effect of oil shale on Na+ solidification of red mud-fly ash cementitious material

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Abstract

Red mud-fly ash based cementitious material mixed with different contents of oil shale calcined at 700°C is investigated in this paper. The effect of active Si and Al content on the solidification of Na+ during the hydration process is determined by using X-ray diffraction (XRD), 27Al and 29Si magic-angle-spinning nuclear magnetic resonance (MAS-NMR), infrared (IR), scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It is shown that the content of oil shale has a remarkable effect on the solidified content of Na+. The hydration process generates a highly reactive intermediate gel phase formed by co-polymerisation of individual alumina and silicate species. This kind of gel is primarily considered as 3D framework of SiO4 and AlO4 tetrahedra interlinked by the shared oxygen atoms randomly. The negative charges and four-coordinated Al inside the network are mainly charge-balanced by Na+. The solidifying mechanism of Na+ is greatly attributed to the forming of this kind of gel.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Xiao-ming Liu  (刘晓明), Yu Li  (李 宇) & Da-qiang Cang  (苍大强)

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xiao-ming Liu  (刘晓明), Yu Li  (李 宇) & Da-qiang Cang  (苍大强)

  3. Pacific Resources Research Center, School of Engineering and Computer Science, University of the Pacific, Stockton, CA, 95211, USA

    Heng-hu Sun  (孙恒虎)

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  1. Xiao-ming Liu  (刘晓明)
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  2. Yu Li  (李 宇)
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  3. Heng-hu Sun  (孙恒虎)
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  4. Da-qiang Cang  (苍大强)
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Correspondence to Xiao-ming Liu  (刘晓明).

Additional information

Foundation item: the National Natural Science Foundation of China (Nos. 51034008 and 51104008), the China Postdoctoral Science Foundation Funded Project (No. 20100480202), the Research Fund for the Doctoral Program of Higher Education of China (No. 20100006120010) and the Fundamental Research Funds for the Central Universities of China (No. FRF-TP-12-026A)

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Liu, Xm., Li, Y., Sun, Hh. et al. Effect of oil shale on Na+ solidification of red mud-fly ash cementitious material. J. Shanghai Jiaotong Univ. (Sci.) 17, 723–729 (2012). https://doi.org/10.1007/s12204-012-1353-2

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  • DOI: https://doi.org/10.1007/s12204-012-1353-2

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