Highly concentrated carbon nanotube admixture for nano-fiber reinforced cementitious materials

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Enhanced mechanical properties of cement paste by hybrid graphene oxide/carbon nanotubes (2017, methodology): “[8] also found that effective dispersion of different length MWCNTs in water was achieved by applying ultrasonic energy and in combination with the use of a surfactant.”
Nano-modification of cementitious material: toward a stronger and durable concrete (2016, methodology): “More recently, Metaxa applied this dispersion method on four different types of CNFs and investigated the appropriate amount of ultrasonic energy and the surfactant to CNF ratio (SFC/CNF) for effective dispersion [45].”
Effect of ultrasonication energy on engineering properties of carbon nanotube reinforced cement pastes (2015, background): “A proper UE may bring more pronounced reinforcing effect than either at low or excessive ultrasonication [25,26].”
Review on concrete nanotechnology (2016, background): “MWCNT suspensions ultracentrifuged for: (a) 30 min; (b) 45 min; (c) 60 min (Metaxa et al., 2012).”