Abstract
The voltage–current characteristics of a nickel powder (NP)-filled cement-based composite(NPCC) and the variation of electrical resistivity of NPCC under compressionare studied by using a four-pole method based on embedded loop electrodes.The generation of conductivity and piezoresistivity in NPCC is investigated byexamining the morphology of NPCC by SEM and studying the variation ofdistance between NP particles under compression. Experimental results indicatethat the electrical conductivity of NPCC is ohmic when the voltage is below3.5 V. Although NP particles are dispersed in the cement matrix and they do notform a connected conductive network, NPCC has a low electrical resistivity of2.29 × 103Ω cm without loading. A decrease of 0.042% in the fractional change in volume of NPCC undercompression causes the tunneling distance to decrease 0.60–1.42 nm and the fractionalchange in electrical resistivity to reach 62.61%. It is therefore concluded that theimprovement of conductivity and piezoresistivity of NPCC is due to the quantum tunnelingeffect.
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