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Volume 37 Issue 5
May  2011
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Journal of Beijing University of Aeronautics and Astronautics  > 2011  >  37(5): 556-559,578.
ZHENG Lei, HU Weiduo, LIU Changet al. Large crater identification method based on deep learning[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(5): 994-1004. doi: 10.13700/j.bh.1001-5965.2019.0342(in Chinese)
Citation: Gan Weimin, Huang Xin, Chen Pengfeiet al. Piezoresistivity of cement based material with small amount of graphite[J]. Journal of Beijing University of Aeronautics and Astronautics, 2011, 37(5): 556-559,578. (in Chinese)
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Piezoresistivity of cement based material with small amount of graphite

  • School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 20 Oct 2010
  • Publish Date: 30 May 2011
    Abstract
  • Graphite-cement specimens were made by adding water reducing agent in cement, and the specimens- piezoresistivity in a destructive overload experiment was mensurated by a series connected AC circuit. The results present that, if a small amount of graphite was mixed in, the cement material-s uniaxial compressive strength will decrease, at the same time the material-s piezoresistence coefficient will ascend. As the amount of graphite was increased within a small range, the deviation of specimens- relative resistivity decreases, and the piezoresistivity of the material increases. Furthermore, the resistivity of the specimens becomes stable while being loaded. By examining the piezoresistivity curves of the graphite-cement material, similar shape with the stress-strain curves can be got in these experiments. There are three stages while the material-s relative resistivity is changing along with the increase of stress imposed on it which are undulate stage, slowly descend stage and rapidly descend stage. These stages are accordant to the three stages of the failure of cement based material, which are elastic stage, elastic-plastic stage and failure stage.

     

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