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Abstract：
This investigation explores the potential of electrochemical impedance spectroscopy (EIS) in evaluating graphene-based cementitious nanocomposites, focusing on their physical and structural properties, i.e., electrical resistivity, porosity, and fracture toughness. EIS was employed to study cement mixtures with varying graphene nanoplatelet (xGnP) concentrations (0.05-0.40% per dry cement weight), whereas flexural tests assessed fracture toughness and porosimetry analyses investigated the structural characteristics. The research demonstrated that the electrical resistivity initially decreased with increasing xGnP content, leveling off at higher concentrations. The inclusion of xGnPs correlated with an increase in the total porosity of the cement mixtures, which was indicated by both EIS and porosimetry measurements. Finally, a linear correlation emerged between fracture toughness and electrical resistivity, contributing also to underscore the use of EIS as a potent non-destructive tool for evaluating the physical and mechanical properties of conductive nano-reinforced cementitious nanocomposites.
摘要：
这项研究探讨了电化学阻抗谱（EIS）在评估石墨烯基水泥基纳米复合材料中的潜力，关注它们的物理和结构特性，即，电阻率，孔隙度,和断裂韧性。EIS用于研究具有不同石墨烯纳米片（xGnP）浓度（每干燥水泥重量0.05-0.40％）的水泥混合物，而弯曲试验评估断裂韧性和孔隙率分析研究的结构特征。研究表明，电阻率最初随着xGnP含量的增加而降低，在较高浓度下趋于稳定。包含xGnPs与水泥混合物总孔隙率的增加相关，EIS和孔隙率测量都表明了这一点。最后,断裂韧性和电阻率之间出现线性关系，还有助于强调使用EIS作为一种有效的非破坏性工具，用于评估导电纳米增强水泥基纳米复合材料的物理和机械性能。
