REINFORCEMENT OF CEMENT MORTAR WITH ALUMINA NANOFIBERS Authors
REINFORCEMENT OF CEMENT MORTAR WITH ALUMINA NANOFIBERS Authors: S S Dobrosmyslov, E V Peresypkin, A S Voronin, Y V Fadeev, S. V. Khartov • Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences • Siberian Federal University Krasnoyarsk 2020
Alumina nanofibers • Image of aluminum oxide nanofibers obtained using transmission electron microscopy: (a) macro-block aluminananofibers; (b) aluminananofibers at 40000 x magnification; (c) aluminananofibers at 200000 x magnification.
The viscosity of a cement paste The depth of immersion of the metal rod in the cement paste, depending on the alumina nanofibers
Micrographs of a cement mortar reinforced with alumina nanofibers Micrographsofacementmortar reinforced with aluminananofibers: (a)micrograph at 100 x magnification; (b) aluminananofibers at 500 x magnification
Physical and mechanical properties Flexural and compressive strength of cement mortar depending on the concentration of alumina nanofibers P – flexural or compressive strength, P 0 – flexural or compressive strength without alumina nanofibers
Conclusion : • We have studied the effect of aluminananofiberson the physical and mechanical properties of the cement matrix. Ultrasonic treatment allows obtaining a stable aqueous dispersion of the fiber, which can be used as mixing water for a cement binder system. • At a concentration of aluminananofibersof 0. 2% or more, there is a significant increase in the viscosity of the cement paste, associated with the interaction of individual fibers with each other. • The increase in the compressive strength of cement mortar reinforced with nanofibers of aluminum oxide is 20% at a concentration of 0. 05%; flexural strength increases by 45% at 0. 1% concentration.
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