期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 203, 期 -, 页码 146-163出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.01.081
关键词
Cement-based sensor; Piezoresistivity; Resistivity measurement; Sensitivity; Environmental condition
资金
- Australian Research Council [DE150101751]
- ARC Industrial Transmission Research Hub Nano-geopolymer composites for underground prefabricated structures
- Wuhan Zhihe Geotechnical Engineering Co., Ltd, Australia [IH150100006]
- National Engineering Laboratory for High-speed Railway Construction, Central South University, China [HSR2017001]
- State Key Laboratory of Subtropical Building Science (South China University of Technology), China [2019ZA06]
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, China [SYS112018-01]
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. (C) 2019 Elsevier Ltd. All rights reserved.
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