Abstract
This paper studies the piezoresistive property of the CNT/cement composite to explore itsfeasibility as an embedded stress sensor for civil structures such as roadways, levees andbridges. The experimental results show that the electrical resistance of the CNT/cementcomposite changes with the compressive stress level, indicating the potential of using theCNT/cement composite as a stress sensor for civil structures. The piezoresistive responsesof the composite with different fabrication methods and CNT doping levels were alsostudied. It is found that dispersion-assistant surfactants could block the contacts amongcarbon nanotubes, thus impairing the piezoresistive response of the composite, while ahigher CNT doping level could improve the sensitivity of the composite stress response.
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