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The two types of nano carbons (NCs); carbon nanofibers (CNFs) and carbon nanotubes (CNTs) have been studied in numerous research works, which can extraordinarily enhance the mechanical properties of structural composites (concrete or soil-cement). Their amazing mechanical properties and tremendously high aspect ratios make NCs as the most valuable nanomaterials for nano-reinforcement. Yet, the dispersion of NCs is the major factor that strongly affects the properties of nan composites. A good deal of research has been carried out on chemical methods (chemical agent) to attain homogeneous dispersion of nano carbon in water. While if not precisely done, it can damage or shorten NCs and at the worst can dissolve them. This results in a negative effect on composites. Considering this, NCs can be physically dispersed in water and then mixed with composites.  This paper presents a discussion on types of NCs and different dispersion techniques (chemical and physical), and research works in improve of soil properties use NCs.

Key words: Nano carbon, carbon tubes, carbon fibers, dispersion

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