Concrete supplier 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)
HKCC 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 cir cuit.The results present that,if a small amount of graphite was mixed in,the cement material's uniaxial com pressive 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 decree ses,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,elasticplastic stage and failure stage. Concrete supplier
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