The strong piezoresistivity and piezopermittivity inherent in cement paste without functional admixture are evaluated and unprecedentedly correlated, with relevance to resistance-based and capacitance-based structural self-sensing, respectively. Compression (low elastic regime) decreases the resistivity and increases the permittivity, indicating respectively positive piezoresistivity (unprecedentedly high gage factor ≤20400) and negative piezopermittivity (magnitude of the fractional change in capacitance per unit strain ≤4710). Both effects are strengthened by decreasing the strain (8 × 10–7 × 10), or increasing either the frequency (2–100 kHz) or electric field (0.09–0.50 V/mm). The resistivity decreases greatly with increasing frequency, while the permittivity decreases less, both because of the sluggishness of the ion movement. Electric field increase raises the capacitance/resistance. Upon unloading, the capacitance decreases to below that before loading. The electrodes sandwich the specimen, being adjacent to the stressed region. The fringing electric field reaching the stressed region facilitates the sensing, being strengthened by increasing the frequency or electric field.

中文翻译：

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无功能外加剂水泥基材料的强压阻和压介电常数及其相关性


对不含功能性外加剂的水泥浆体固有的强压阻率和压介电常数进行了评估，并进行了前所未有的关联，分别与基于电阻和基于电容的结构自传感相关。压缩（低弹性状态）会降低电阻率并增加介电常数，分别表明正压阻率（前所未有的高应变系数≤20400）和负压介电常数（每单位应变电容分数变化的幅度≤4710）。通过降低应变 (8 × 10–7 × 10) 或增加频率 (2–100 kHz) 或电场 (0.09–0.50 V/mm) 可以增强这两种效应。电阻率随着频率的增加而大幅下降，而介电常数下降较少，这都是因为离子运动缓慢。电场增加会增加电容/电阻。卸载后，电容降至加载前以下。电极将样品夹在中间，靠近应力区域。到达应力区域的边缘电场有利于传感，通过增加频率或电场来加强。