Effects of Content Level and Particle Size of Nickel Powders on Piezoresistivity of Smart Cement-based Composites

Han Baoguo; Ou Jinping

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Effects of Content Level and Particle Size of Nickel Powders on Piezoresistivity of Smart Cement-based Composites

Han Baoguo * #,Ou Jinping

School of Civil Engineering, Harbin Institute of Technology

*Correspondence author

#Submitted by

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Funding: 教育部博士点基金（No.20070213080）

Opened online:26 January 2010

Accepted by: none

Citation: Han Baoguo,Ou Jinping.Effects of Content Level and Particle Size of Nickel Powders on Piezoresistivity of Smart Cement-based Composites[OL]. [26 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39506

The piezoresistivity of cement-based composites have attracted a lot of research attention due to its potential application in structural health monitoring. In order to explore the effects of content level and particle size of nickel powders on the piezoresistivity of cement-based composites, the electrical resistivity of cement-based composites containing nickel powders with particle sizes in the range of 3-7μm, 2.6-3.3μm and 2.2-2.8μm was measured and its variation under uniaxial compression was studied. The differences in electrical conductivity and piezoresistivity of these composites were investigated by examining the morphology of composites using scanning electron microscope. The experimental results show that content level and particle size of nickel powders are two key factors that influence the piezoresistivity of cement-based composites, which are due to the different conductive characteristics of the composites. It is also found that the cement-based composite containing 24 vol.% of nickel powder with particle size in the range of 3-7μm possesses moderate electrical conductivity and the best piezoresistivity among cement-based composites with different content levels and particle sizes of nickel powders.

Keywords:Nickel powder;cement-based composites;piezoresistivity;content level;particle size

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