Effect of CNT and CNF loading and count on the corrosion resistance, conductivity and mechanical properties of nanomodified OPC mortars

High‐Performance Graphene‐Based Cementitious Composites

“…[2] Within this framework, the application of principles of nanotechnology in concrete structures has recently emerged as an attractive solution. [11][12][13][14][15][16][17] However, the production of novel cement nanocomposites involves the perplexing problem of disentanglement and uniform distribution of nanomaterials within cement matrix. Nanotechnology innovations for construction industry comprise high strength, durability and sustainability of structural composites, self-cleaning, antimicrobial, anticorrosion, and air purifying surfaces, as well as sensing devices and self-sensing members for structural health and safety monitoring.…”

“…Nanotechnology innovations for construction industry comprise high strength, durability and sustainability of structural composites, self-cleaning, antimicrobial, anticorrosion, and air purifying surfaces, as well as sensing devices and self-sensing members for structural health and safety monitoring. Examples that have been reported to date involve functionalization [15] and acid treatment [16] of CNTs, as well as stirring and ultrasonication of CNTs with various types of surfactants [11,12,14,17] or solvents. [11][12][13][14][15][16][17] However, the production of novel cement nanocomposites involves the perplexing problem of disentanglement and uniform distribution of nanomaterials within cement matrix.…”

“…[7,8] Since the discovery of multi-walled [9] and singlewalled [10] carbon nanotubes (CNTs) in 1990s, CNTs have become the most studied carbon nanomaterial in concrete technology. [13] The addition of CNTs can, in particular, enhance the mechanical properties of cement composites [11,[15][16][17] (see Table 1), refine their pore structure, [11,[14][15][16] and reduce the drying shrinkage. Carbon-based nanoparticles are prone to form agglomerates and bundles in aqueous environment, thereby hindering their uniform dispersion in cement paste.…”

Nanomaterials in Structural Engineering

“…Several different attempts to obtain a homogeneous dispersion of CNTs in cement mix were reported, including carboxylation of CNTs [21], that is, special treatment to attach carboxylic acid to their surface or functionalization of CNTs with COOH groups [22,23]. Nevertheless, the main approach employed to fabricate cement-CNT composites is, clearly, stirring and ultrasonication of aqueous dispersion of CNTs with various types of surfactants, such as polycarboxylic acid-based superplasticizers [23][24][25], anionic sodium dodecyl sulfate [20,26], sodium dodecyl benzene sulfonate [27], nonionic polyoxyethylene(23) laurylether [20], Gum Arabic [22,28], polyacrylic acid polymer [22], and cetyltrimethylammonium bromide [27], to name a few, or solvents, for instance, acetone [29]. It is worth noting that the studies on CNTs dispersion [20,30] have shown that the most beneficial dispersion is the one with a CNT-tosurfactant ratio of 1:1-1:5.…”

“…CNTs can enhance both the compressive and flexural strength of cementitious composites up to 50 [22] and 87% [24], respectively. The addition of CNTs also improves both the fracture energy and flexural toughness [31].…”