Investigation of freeze-thaw deterioration effects on electrical properties and electric-heating capability of CNT-CF incorporated cement mortar

초록

The present study investigates the impact of freeze-thaw deterioration on the electrical properties and electric-heating capabilities of cement mortar incorporating with carbon nanotubes (CNT) and carbon fibers (CF). Mortar samples, containing 0.5 wt.% CNT and 0.1 wt.% CF relative to the mass of cement, were prepared and subjected to freeze-thaw tests for up to 300 cycles. The electrical properties and electric-heating capability were evaluated every 30 freeze-thaw cycles, and the physicochemical characteristics of the samples were analyzed using X-ray diffraction and mercury intrusion porosimetry. The results indicate a decline in both electrical conductivity and heat-generation capability as the freeze-thaw cycles progress. Furthermore, changes in the pore structure of the mortar samples during the freeze-thaw cycles contributed to damage in the conductive network formed by CNT and CF, resulting in decreased electrical conductivity and heat-generation capabilities of the mortar samples.

키워드