Abstract
When developing cementitious self-sensing composites, a surfactant must provide good CNT dispersion, be compatible with the cementitious matrix and improve the piezoelectric properties of the nanocomposite. This study used CNTs with superplasticizer (SP), carboxymethylcellulose (CMC) and sodium dodecyl sulfate (SDS) and their combinations (SPMC, SPSDS) to compare the dispersion quality of CNTs. SPMC25 showed the best overall results; however, SDS and SPSDS, although showing high levels of UV–vis absorption, also produced good results. The percolation threshold of SPMC25 and SPSDS was 0.025% to 0.1% and the gauge factor of 0.1% SPMC25 reached 126.7. These combinations showed greater sensitivity than sensors made with cement mortar and 0.1% CNT.
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