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Damping capacity and flexural strength of multi-walled carbon nanotube/cement composites
LUO JianLin; DUAN ZhongDong
Journal of Beijing University of Chemical Technology ›› 2008, Vol. 35 ›› Issue (6) : 63-66.
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Damping capacity and flexural strength of multi-walled carbon nanotube/cement composites
Five fiber reinforced cement composites (FRCs) with varying multi-walled carbon nanotube (MWNTs) loadings were castmixed with the aid of surfactants and ultrasonic dispersion. Their damping capacities and flexural strengths were investigated by the free vibration testing method in an elastic system, and the three-point bending technique, respectively, and the microstructure morphologies of the MWNT distributions within the cement matrix were observed and analyzed. The results show that there are positive effects on the resonant damping ratio (ζ) and flexural strength (σ-t) of FRCs associated with addition of some MWNTs, with enhancement amplitudes of 24.5% and 35.98%, respectively, relative to the reference. The in-filling and bridging effect on the micro & nano scale of fumed silica and nanotubes, and the elasticplastic fluctuation effect, the
inner surface frictions between the MWNTs and the interfaces between the MWNTs a
nd matrix greatly increase, which contribute to the observed good damping capaci
ties and mechanical reinforcement afforded by the FRCs.
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