Study on the electrical conductivity of novel electrically conductive cementitious composites
Using carbon black as the main conductive dopant,and a small amount of carbon nanotubes and steel fibers are added to construct a highly efficient conductive network to improve the conductivity,and its stability in different environments as well as synergistic effects of the composite-phase conductive dopant in the microscopic morphology are investigated.The results in-dicate that the novel electrically conductive cementitious composites,denoted as C5P3F6,with 5％carbon black,0.3％carbon nan-otubes,and 0.6 vol.％steel fibers,exhibited a resistivity of 304Ω·cm after 28 days of curing.This represents a 94.5％reduction in resistivity compared to traditional electrically conductive cementitious composites.Furthermore,the composite material with 5％carbon black,0.9％carbon nanotubes,and 0.6 vol.％steel fibers demonstrated minimal impact from cement hydration,drying conditions,and temperature,displaying excellent stability.Excellent dispersion of conductive dopants can be observed in the microscopic morphology,and carbon nanotubes and steel fibers effectively bridge into a conductive network in synergy with the dispersed carbon black.
万方数据
维普
