Abstract
In this paper, the effects of graphene content, water-to-binder ratio (w/b) and curing age on the conductivity of magnesium sulfate cement were evaluated. Besides, the enhancement and conductivity mechanism of graphene was analyzed by means of electrochemical impedance spectroscopy (EIS) technique and scanning electron microscopy (SEM). As a result, the conductivity of the composite was improved and percolation phenomenon was observed. The conductivity percolation interval of the specimens was about 0.6 wt%–1.4 wt%. The relationship between conductivity and graphene content was described. The conductivity of the composite was improved with the interaction of ionic conduction, graphene tunnel conduction and contact conduction.
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