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Portland cement pastes 1 day to 1 month old were each subjected to a single cycle of 1250 V/m electric field (15 s forward, 15 s off, 15 s reverse) and analyzed for microstructural/transport changes by impedance spectroscopy. All samples experienced an irreversible increase in resistance, as much as 20-25%, which decreased with increasing age of the paste. Subsequent applications of field produced...
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