Carbon fiber and PVA fiber reinforced concrete: Electrical resistivity and piezoresistive properties

• A 0.6 % CF and 0.6 % PVA F mix boosts piezoresistivity by 45 %. • Rough PVAF improve bonding and toughness for the smooth surfaces of CF. • Better conductivity and sensitivity for structural health monitoring and lightning protection. This study examines the effects of carbon fiber (CF) and polyvinyl alcohol fiber (PVAF) on the mechanical and electrical properties of fiber-reinforced concrete by using four-electrode system and piezoresistive testing platforms. The optimal combination of 0.6 % CF and 0.6 % PVAF significantly improved piezoresistive properties, with a 45 % increase in relative resistivity. Additionally, 0.6 % CF with 0.9 % PVAF achieved a 13 % boost in compressive strength. SEM analysis revealed enhanced interfacial bonding between fibers, leading to improved mechanical and electrical performance. These findings highlight the composite’s potential for structural health monitoring, electromagnetic shielding, and winter snow removal applications.