Stabilized electrical conductivity in nano-engineered ultra-high performance concrete under prolonged freezing exposure: Nano-reinforcement and cryo-induced water migration mechanism

Concrete with stable electrical conductivity is essential for critical intelligent infrastructure functions such as self-monitoring and deicing, but its performance under long-term freezing exposure remains a major challenge. This study developed a multifunctional carbon fiber strengthened ultra-high performance concrete (CFS-UHPC) by incorporating nano carbon blacks (NCBs) and carbon nanofibers (CNFs), achieving exceptional electrical conductivity under prolonged freezing exposure (-7.5°C). Results identified the benefits of low-content CNFs on improving the mechanical strength and highlighted NCBs as the pivotal component for electrical stability, yielding resistances of 455.5 Ω and 533.17 Ω at 28 and 135…

• NS
  Natural Science Foundation of Jiangxi Province