Abstract
Electrically conductive cementitious composites (ECCCs) have been widely used to complete functional and smart construction projects. Graphite, due to its low cost and wide availability, is a promising electrically conductive filler to generate electrically conductive networks in cement matrixes. Cement-based materials provide an ideal balance of safety, environmental protection, strength, durability, and economy. Today, graphite is commonly applied in traditional cementitious materials. This paper reviews previous studies regarding the effects and correlations of the use of graphite-based materials as conductive fillers on the properties of traditional cementitious materials. The dispersion, workability, cement hydration, mechanical strength, durability, and electrically conductive mechanisms of cementitious composites modified with graphite are summarized. Graphite composite modification methods and testing methods for the electrical conductivity of ECCCs are also summarized.
Highlights
Cement is a dielectric material which functions as an ionic conductor due to its water content [1]
Cementitious composite materials with high electrical conductivity can be obtained by modification with conductive carbon fillers such as graphite power (GP) [3], graphene [4], carbon nanotubes (CNTs) [5], carbon fibers (CFs) [6], and carbon black (CB) [7] to form conductive networks inside the cementitious matrix [8]
The results showed that these groups can be grafted onto the surface of graphene nanoplatelets (GNPs), weakening the interaction between the graphene layers to further improve their hydrophilicity and dispersion
Summary
Cement is a dielectric material which functions as an ionic conductor due to its water content [1]. The addition of functional fillers can endow some properties of electrically conductive cementitious composites (ECCCs), such as the electromagnetic (EM) shielding effect [8,9,10,11]. Compared with other carbon allotropic forms (2D graphene, 1D CNTs, 1D CFs, and 0D CB), 3D GP is an ideal electric conduction phase for improving the electrical and mechanical properties of cement-based materials [3,23,28]. This review covers the dispersion, workability, cement hydration, mechanical strength, durability, and electrical conductivity of traditional cementitious materials modified with graphite. Various modify graphite composite modification methods and testing methods for the electrical conductivity of ECCCs are summarized
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