@ARTICLE{Muthu_Murugan_Piezoresistive_2024,
 author={Muthu, Murugan and Sadowski, Łukasz},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={e149815},
 howpublished={online},
 year={2024},
 abstract={This study examined the self-sensing performance of metakaolin-based geopolymer paste samples activated by an alkali activator, which is a solution mixture of potassium hydroxide and silica fume (SF). Their piezoresistive response under repeated compressive loads was found to improve with increasing SF content. It was found from their XRD, SEM, and FTIR results that the change in the SF content did not alter the phase composition of the geopolymer matrices. The factorial change in the electrical resistivity of geopolymer samples with a maximum SF content was calculated to be about 0.024. Their pore solutions were detected to be mainly filled with potassium and silicon ions due to the use of higher concentrations of SF particles. The UV spectrophotometry measurements of this study confirm that all the geopolymer samples displayed semiconductor behaviour. The SF-derived alkaline activator can enable the self-sensing character of geopolymer-based concrete, which isenvironmentally friendly and has recently shown great potential to monitor structural integrity under applied external loads.},
 type={Article},
 title={Piezoresistive response of geopolymer pastes activated by silica fume-derived alkaline solution},
 URL={http://www.journals.pan.pl/Content/130499/PDF-MASTER/BPASTS-04170-EA.pdf},
 doi={10.24425/bpasts.2024.149815},
 keywords={geopolymer, metakaolin, silica fume, alkaline activator, piezoresistivity, microstructure},
}