Piezoresistive properties of cement-based sensors: Review and perspective
By Wenkui Dong, Wengui Li, Z. Tao, Kejin Wang. Construction and Building Materials, 2019
324 citations recorded by the source corpus.
Abstract Cement-based sensors are increasingly used in smart concrete to self-sense and monitor the damages and cracks through the measurements of concrete electrical resistivity. The fundamental concepts, key components, manufacturing process, piezoresistivity measurements, and primary applications of cement-based sensors are reviewed in this paper. Various materials, mechanical and environmental factors affecting concrete piezoresistive properties are explicated. Some contradictory results from different studies are reported and discussed. Future perspectives of piezoresistive cement-based sensors are also delineated. The review reveals that there is an optimal conductor content, below which the sensor would perform more like plain concrete with high resistivity and low sensitivity, while excessively higher than which, the dispersion of the conductive phase could become difficult, thus increasing resistivity. The manufacturing process, such as the dispersion method of conductors and curing condition, plays a significant role in conductor distribution, matrix density and pore structure of the sensors, which, together with rheology of the sensor composite, consequently alters the piezoresistive properties of the sensors. In addition to responding to mechanical loading, cement-based piezoresistive sensor also has a great potential for monitoring behaviour of concrete under freeze-thaw cycling. It is expected that this review will provide not only an orientation for new researchers to explore and engage in related studies but also an insight for experienced researchers to perform transformational examinations into cement-based piezoresistive sensors.
Subfields: Civil and Structural Engineering, Pollution
View Paper: https://www.semanticscholar.org/paper/f526736d52a90e3fdba03c3700d8e400fa4f2269
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Citations in the corpus
- Piezoresistive behaviours of cement-based sensor with carbon black subjected to various temperature and water content (2019, background): “It is believed that the resistivity of composite can vary significantly with temperature and humidity, let alone their influences on piezoresistivity [23].”