PSI - Issue 64

Wenkui Dong et al. / Procedia Structural Integrity 64 (2024) 1152–1159 Wenkui Dong and Marco Liebscher et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6. Schematic illustration presents the superior experimental set-up for the MCF with inner electrodes under flexural loading.

4. Conclusion This study explored the stress-sensing and piezoresistivity of mineral-impregnated carbon fibre (MCF) reinforcement under flexural load for the first time and examined the influence of electrode configuration on stress sensing performance. The findings revealed that MCF, characterized by outstanding electrical conductivity, indeed exhibited the capacity for stress-sensing. Moreover, MCF equipped with outer electrodes demonstrated better electrical conductivity, albeit with relatively smaller FCR and stress-sensing sensitivity. Conversely, MCF equipped with inner electrodes exhibited the opposite trend. The piezoresistive behavior was observed to be more stable and repeatable in MCF with outer electrodes. Future work in this study will explore the sensing capabilities of concrete structures embedded with MCF. Acknowledgements This research is funded by DFG German Research Foundation SFB TRR 339. References W. Dong, W. Li, Z. Tao, K. Wang, 2019a. Piezoresistive properties of cement-based sensors: Review and perspective. Construction and Building Materials 203, 146-163. W. Dong, W. Li, Y. Guo, Z. Sun, F. Qu, R. Liang, S.P. Shah, 2022b. Application of intrinsic cement-based sensor for traffic detections of human motion and vehicle speed. Construction and Building Materials 355, 129130. W. Dong, W. Li, L. Shen, Z. Sun, D. Sheng, 2020c. Piezoresistivity of smart carbon nanotubes (CNTs) reinforced cementitious composite under integrated cyclic compression and impact. Composite Structures 241, 112106. G. Karalis, J. Zhao, M. May, M. Liebscher, I. Wollny, W. Dong, T. Köberle, L. Tzounis, M. Kaliske, V. Mechtcherine, 2024. Efficient Joule heaters based on mineral-impregnated carbon-fiber reinforcing grids: An experimental and numerical study on a multifunctional concrete structure as an electrothermal device. Carbon 222, 118898. J. Zhao, M. Liebscher, K. Schneider, D. Junger, V. Mechtcherine, 2023a. Effect of surface profiling on the mechanical properties and bond behaviour of mineral-impregnated, carbon-fibre (MCF) reinforcement based on geopolymer. Construction and Building Materials 367, 130199. J. Zhao, G. Karalis, M. Liebscher, L. Tzounis, T. Köberle, D. Fischer, F. Simon, M. Al Aiti, G. Cuniberti, V. Mechtcherine, 2023b. Mineral impregnated carbon-fiber based reinforcing grids as thermal energy harvesters: A proof-of-concept study towards multifunctional building materials. Energy and Buildings 298, 113564. K. Schneider, A. Michel, M. Liebscher, L. Terreri, S. Hempel, V. Mechtcherine, 2019. Mineral-impregnated carbon fibre reinforcement for high temperature resistance of thin-walled concrete structures. Cement and Concrete Composites 97, 68-77. V. Mechtcherine, A. Michel, M. Liebscher, K. Schneider, C. Großmann, 2020. Mineral-impregnated carbon fiber composites as novel reinforcement for concrete construction: Material and automation perspectives. Automation in Construction 110, 103002.