Electric polarization in carbon fiber-reinforced cement

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Partial replacement of carbon fiber by carbon black in multifunctional cement–matrix composites (2007, background): “The irreversible resistance increase may be partly due to electric polarization, which tends to be more substantial when the electrical resistivity of the cement-based material is higher [48].”
Electrical-resistance-based damage self-sensing in carbon fiber reinforced cement (2007, background): “However, polarization is much less in carbon fiber reinforced cement than cement without carbon fiber [16].”
ELECTRIC POLARIZATION AND DEPOLARIZATION IN CEMENT-BASED MATERIALS, STUDIED BY APPARENT ELECTRICAL RESISTANCE MEASUREMENT (2004, methodology): “In contrast, the time for depolarization was only 120 s (also after polarization for a period of 200 s) for carbon fiber (amorphous) cement paste [1], so that polarization was slightly slower than depolarization.”
The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement (2006, background): “This voltage affects the flow of charges, hence causing the measured resistivity to increase [27,28].”
Piezoresistive behaviours of cement-based sensor with carbon black subjected to various temperature and water content (2019, background): “ions in electric field until reaching electrical potential balance [45].”