ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2025
Physical Origin of Temperature Induced Activation Energy Switching in Electrically Conductive Cement.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Electrically conductive cement (CEMe), enabled by percolative networks of conductive fillers, presents a promising future for multifunctional cementitious composites in next-generation sustainable infrastructure. However, the mechanisms governing temperature-dependent charge transport, particularly the temperature-induced switching of Arrhenius activation energy, remain poorly understood. This study provides a rigorous investigation into the physical origin of variable activation energy behaviour in CEMe across different percolation regimes, a key factor for ensuring reliable multifunctional performance. It is demonstrated that activation energy switching arises from structural degradation within the biphasic conduction architecture: ionic transport through liquid-filled connected pore network and electronic conduction via conductive carbon fibre network. In contrast, the intrinsic non-Arrhenius behaviour of the pore solution and the Arrhenius behaviour of the carbon fibre have negligible influence on the overall activation energy switching behaviour. For the first time, Meyer-Neldel Rule (MNR) is observed in CEMe, attributed to the stable intrinsic conductivity (≈0.046 S m
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