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Volume 26 Issue 10
Oct.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(10): 1329-1336
Juan-hong Liu, Yu-cheng Zhou, Ai-xiang Wu,  and Hong-jiang Wang, Reconstruction of broken Si–O–Si bonds in iron ore tailings (IOTs) in concrete, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1329-1336. https://doi.org/10.1007/s12613-019-1811-z
Cite this article as:
Juan-hong Liu, Yu-cheng Zhou, Ai-xiang Wu,  and Hong-jiang Wang, Reconstruction of broken Si–O–Si bonds in iron ore tailings (IOTs) in concrete, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1329-1336. https://doi.org/10.1007/s12613-019-1811-z
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研究论文

Reconstruction of broken Si–O–Si bonds in iron ore tailings (IOTs) in concrete

  • School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China

  • 通讯作者:

    Yu-cheng Zhou    E-mail: zhouyucheng1994@hotmail.com

  • This paper reports a study on the reconstruction of broken Si-O-Si bonds in iron ore tailings (IOTs) in concrete. Limestone and IOTs were used to investigate the influence of different types of coarse aggregates on the compressive strengths of concrete samples. The differences in interfacial transition zones (ITZs) between aggregate and paste were analyzed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Meanwhile, X-ray diffraction (XRD) and infrared spectroscopy (IR) were used to study microscopic changes in limestone and IOTs powders in a simple alkaline environment that simulated cement. The results show that the compressive strengths of IOTs concrete or paste are higher than those of limestone concrete or paste under identical conditions. The Ca/Si atom ratios in the ITZs of IOTs concrete samples are lower than those of limestone concrete; the diffraction peak of the calcium silicate phase at 2θ=29.5°, as well as the bands of Si-O bonds shifting to lower wavenumbers, indicates reconstruction of the broken Si-O-Si bonds on the surfaces of IOTs with Ca(OH)2.
    • Research Article

    Reconstruction of broken Si–O–Si bonds in iron ore tailings (IOTs) in concrete

    + Author Affiliations
      Abstract
    • This paper reports a study on the reconstruction of broken Si-O-Si bonds in iron ore tailings (IOTs) in concrete. Limestone and IOTs were used to investigate the influence of different types of coarse aggregates on the compressive strengths of concrete samples. The differences in interfacial transition zones (ITZs) between aggregate and paste were analyzed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Meanwhile, X-ray diffraction (XRD) and infrared spectroscopy (IR) were used to study microscopic changes in limestone and IOTs powders in a simple alkaline environment that simulated cement. The results show that the compressive strengths of IOTs concrete or paste are higher than those of limestone concrete or paste under identical conditions. The Ca/Si atom ratios in the ITZs of IOTs concrete samples are lower than those of limestone concrete; the diffraction peak of the calcium silicate phase at 2θ=29.5°, as well as the bands of Si-O bonds shifting to lower wavenumbers, indicates reconstruction of the broken Si-O-Si bonds on the surfaces of IOTs with Ca(OH)2.
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