新型导电水泥基复合材料导电性能研究

Study on the electrical conductivity of novel electrically conductive cementitious composites

采用炭黑作为主要导电掺料,加入少量碳纳米管和钢纤维构建高效导电网络以提高导电性能,研究其在不同环境中的稳定性以及微观形态下复相导电掺料的协同作用。结果表明:掺5%炭黑、0.3%碳纳米管、0.6%体积掺量钢纤维的导电水泥基复合材料C5P3F6固化28 d电阻率为304Ω·cm,比传统水泥基复合材料降低94.5%;掺5%炭黑、0.9%碳纳米管、0.6%体积掺量钢纤维的导电水泥基复合材料C5P9F6受水泥水化、干燥环境和温度的影响较小,表现出较为优异的稳定性。微观形态下能观察到导电掺料分散性较好,碳纳米管、钢纤维有效地与分散的炭黑协同作用桥接成为导电网络。

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 indicate that the novel electrically conductive cementitious composites,denoted as C5P3F6,with 5%carbon black,0.3%carbon nanotubes,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.