Abstract
In this paper, the effects of dispersion of multi-walled carbon nanotubes (MWCNTs) on the electrical properties of cement-based composites were systematically investigated. Six different types of surfactants were selected to disperse MWCNTs in cement by sonication, and the effect of ionic nature of surfactants on the electrical resistivity of cement-based composites was investigated. Additionally, experiments were carried out to investigate the effect of dosage of MWCNTs on the piezoresistivity of cement composite under cyclic compressive loading. The results show that the ionic nature of the surfactant influence the electrical resistivity of cement-based composites obviously. Furthermore, adding MWCNTs into cement-based composites is justified to improve their conductivity and the repeatability of piezoresistivity.
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