Piezoresistivity of three dimensional graphene-carbon nanotubes/cement paste

LIU Jintao; HUANG Cunwang; YANG Yang; CAI Qianni

doi:10.13801/j.cnki.fhclxb.20210331.001

Volume 39 Issue 1

Jan. 2022

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LIU Jintao, HUANG Cunwang, YANG Yang, et al. Piezoresistivity of three dimensional graphene-carbon nanotubes/cement paste[J]. Acta Materiae Compositae Sinica, 2022, 39(1): 313-321. doi: 10.13801/j.cnki.fhclxb.20210331.001

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LIU Jintao, HUANG Cunwang, YANG Yang, et al. Piezoresistivity of three dimensional graphene-carbon nanotubes/cement paste[J]. Acta Materiae Compositae Sinica, 2022, 39(1): 313-321. doi: 10.13801/j.cnki.fhclxb.20210331.001

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Piezoresistivity of three dimensional graphene-carbon nanotubes/cement paste

doi: 10.13801/j.cnki.fhclxb.20210331.001

LIU Jintao^{1, 2
,},
HUANG Cunwang^1
,,
YANG Yang^{1, 2
,
,},
CAI Qianni^1
,

1.
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2.
Key Laboratory of Civil Engineering Structure & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou 310023, China

Received Date: 2021-01-15
Accepted Date: 2021-03-24
Rev Recd Date: 2021-03-14

Available Online: 2021-03-31

Publish Date: 2022-01-15

Abstract

Abstract

In order to explore the piezoresistivity of three dimensional graphene-carbon nanotubes (G-CNTs)/cement paste, the four-electrode method was used to study the resistivity change of the G-CNTs/cement paste under load. The influence of G-CNTs content, loading amplitude, loading speed and constant load on the resistivity change was analyzed. The results show that the resistivity decreases first and then tends to stabilize with the increase of the G-CNTs content. When the G-CNTs content increases from 0.2wt% to 1.6wt%, the resistivity decreases by 51.8%. The resistivity is negatively correlated with temperature. When the G-CNTs content is higher than 0.8wt%, the piezoresistivity of the cement paste is significantly improved, and the rate of change in resistivity has an obvious corresponding relationship with the stress-strain. The stress sensitivity coefficient and the strain sensitivity coefficient of the specimens with 1.2wt% G-CNTs are 2.3%/MPa and 291, respectively. The amplitude of the rate of change in resistivity of G-CNTs/cement paste increases as the loading amplitude increasing. The rate of change in resistivity curve corresponding to the stress-strain changes under different loading speeds and constant load exhibits good piezoresistivity.
- three dimensional graphene-carbon nanotube,
- resistivity,
- piezoresistivity,
- cement-based materials,
- sensitivity coefficient
Long Abstrsct
Innovation Points

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References(34)

References

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