The study on piezoresistive performance of graphene cement-based composites
In order to monitor the health of hydraulic concrete structures,self-sensing graphene cement-based composites were prepared.The microscopically analyzed graphene cement-based composites were investigated by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and the piezoresistive performance of the composites were measured by four-electrode method under failure loads,cyclic loads and different relative humidity.The results showed that graphene dispersed in cement matrix formed con-ductive network and graphene did not participate in cement hydration reaction.The decrease of the resistivity of the composite is consistent with the percolation theory.Under the failure load,the resistivity of the composite material shows a trend of"decreasing,equilibrium and increasing".Under cyclic loading,the composites with graphene content of 1.8％,2.0％and 2.4％showed good piezoresistive performance and stability and repeatability at 0,50％,70％and 90％relative humidity.
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