Cement-based sensors should exhibit accurate measurements of strain with high sensitivity and reliability under various environmental conditions. The ability of such sensors to perform in adverse situations needs to be well developed and critically examined. Cement-based sensors are generally embedded in structural/non-structural concrete components for health monitoring. This paper provides an in-depth study of the performance and response of Super Sensitive Carbon Nanofiber Aggregates (SSCNFA) under challenging and adverse environmental conditions, including different temperature, moisture/water exposure, and compressive forces. The SSCNFA detects changes in temperatures, moist environments, and compressive forces through changes in the electrical impedance. In this study, the change in the total impedance of SSCNFAs are experimentally examined by alternating current (AC) measurements (20 Hz–300 kHz) under various environmental conditions. The thermal tests (21 °C–120 °C) and the impedance recovery tests examine and elaborate the phenomenon of resistance and total impedance reduction. The waterproofing test identifies the suitable polymer to prevent moisture percolating through the SSNCFA. Also, compression tests examine the stress/strain sensing through piezoresistivity in the linear elastic limit of the SSCNFA. The effects of these external conditions in the selective frequency range are measured to monitor the stability, reliability, recovery, and performance of the SSCNFA.

中文翻译：

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热、湿气/水和压缩力对超灵敏碳纳米纤维聚集体（SSCNFA）频率响应谱的影响


水泥基传感器应在各种环境条件下准确测量应变，并具有高灵敏度和可靠性。此类传感器在不利情况下执行的能力需要得到充分开发和严格检查。水泥基传感器通常嵌入结构/非结构混凝土构件中，用于健康监测。本文深入研究了超敏感碳纳米纤维聚集体（SSCNFA）在具有挑战性和不利环境条件下的性能和响应，包括不同的温度、湿气/水暴露和压缩力。 SSCNFA 通过电阻抗的变化来检测温度、潮湿环境和压缩力的变化。在本研究中，通过在各种环境条件下测量交流电（AC）（20 Hz-300 kHz）来实验检查 SSCNFA 总阻抗的变化。热测试（21°C–120°C）和阻抗恢复测试检查并详细说明了电阻和总阻抗降低的现象。防水测试确定了合适的聚合物，以防止湿气渗透 SSNCFA。此外，压缩测试还通过 SSCNFA 线性弹性极限内的压阻率来检查应力/应变传感。测量这些外部条件在选定频率范围内的影响，以监测 SSCNFA 的稳定性、可靠性、恢复和性能。