Abstract In this study, different dosages of carbon black (CB) and polypropylene (PP) were added to develop functional cementitious composites as cement-based sensors. The results show that electrical conductivity increased with the amount of PP fibres, due to the enclosed CB nanoparticles and more conductive passages. The compressive strength slightly decreased, while the flexural strength was significantly increased with the increased amount of PP fibres. The improvement is mainly achieved by the reduced CB concentration in cement matrix and the excellent tensile strength of PP fibres. Under the cyclic compression, the piezoresistivity increased by three times for 0.4 wt% PP fibres filled CB/cementitious composite, regardless of the loading rates. The flexural stress sensing efficiency was considerably lower than that of compressive stress sensing, but it increased with the amount of PP fibres. Moreover, fitting formulas were proposed and used to evaluate the self-sensing capacity, with the attempts to apply cement-based sensors for structural health monitoring.

中文翻译：

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使用聚丙烯纤维增强炭黑填充功能水泥基复合材料的压阻

摘要 在本研究中，添加不同剂量的炭黑 (CB) 和聚丙烯 (PP) 以开发功能性水泥基复合材料作为水泥基传感器。结果表明，由于封闭的 CB 纳米颗粒和更多的导电通道，导电率随着 PP 纤维的量而增加。随着PP纤维用量的增加，抗压强度略有下降，而抗弯强度显着增加。这种改进主要是通过降低水泥基体中的 CB 浓度和 PP 纤维的优异拉伸强度来实现的。在循环压缩下，无论加载速率如何，0.4 wt% PP 纤维填充的 CB/水泥复合材料的压阻率都增加了三倍。弯曲应力传感效率远低于压缩应力传感，但随着 PP 纤维的数量增加。此外，提出了拟合公式并用于评估自感知能力，并尝试将水泥基传感器应用于结构健康监测。