Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide
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Yunnan Key Laboratory of Disaster Reduction in Civil Engineering, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
2
Faculty of Civil Aviation and Aeronautics, Kunming University of Science and Technology, Kunming 650500, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2021, 11(1), 206; https://doi.org/10.3390/nano11010206
Received: 4 November 2020
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Revised: 8 January 2021
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Accepted: 11 January 2021
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Published: 15 January 2021
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
A cement-based piezoelectric composite, modified by graphene oxide (GO), was prepared to study piezoresistive capacity. The testing confirms that GO is more effective than other carbon nanomaterials at improving piezoresistive sensitivity of cement-based composites, because the content of GO in cement paste was much lower than other carbon nanomaterials used in previously published research. Further investigation indicates that the addition of GO significantly improved the stability and repeatability for piezoresistive capacity of cement paste under cycle loads. Based on experiment results, the piezoresistive sensitivity of this composite depended on GO content, water-to-cement weight ratio (w/c) and water-loss rate, since the highest piezoresistive gauge factor value (GF = 35) was obtained when GO content was 0.05 wt.%, w/c was 0.35 and water-loss rate was 3%. Finally, microstructure analysis confirmed that conductivity and piezoresistivity were achieved through a tunneling effect and by contacting conduction that caused deformation of GO networks in the cement matrix.
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Keywords:
carbon nanomaterials; mechanical properties; graphene oxide/cement composites; piezoresistive sensitivity; smart cement
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MDPI and ACS Style
Guo, R.; Suo, Y.; Xia, H.; Yang, Y.; Ma, Q.; Yan, F. Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide. Nanomaterials 2021, 11, 206. https://doi.org/10.3390/nano11010206
AMA Style
Guo R, Suo Y, Xia H, Yang Y, Ma Q, Yan F. Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide. Nanomaterials. 2021; 11(1):206. https://doi.org/10.3390/nano11010206
Chicago/Turabian StyleGuo, Rongxin, Yuxia Suo, Haiting Xia, Yang Yang, Qianmin Ma, and Feng Yan. 2021. "Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide" Nanomaterials 11, no. 1: 206. https://doi.org/10.3390/nano11010206
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