Multiscale anti-disturbance Characterization of nanocellulose concrete

Abstract

To alleviate concrete performance deterioration caused by disturbance, it is proposed in this paper that nanocellulose can be used to enhance the anti-disturbance capacity of concrete. Macroscopic strength, mesoscopic pore structure, microstructure, and acoustic emission characteristics were considered simultaneously to analyze the anti-disturbance capacity of nanocellulose concrete, and then to reveal the anti-disturbance mechanism. The research shows that the nanocellulose can induce the growth of C-S-H gel, form a bridge structure between hydration products, and then improve hydration products’ compactness, optimize concrete pore structure, and enhance the anti-disturbance performance of concrete. The research also shows that acoustic emission parameters of nanocellulose concrete with disturbance do not show significant changes, which is consistent with pore structure characteristics of the concrete, confirming the excellent anti-disturbance capacity. Moreover, the evolution law of the b-value obtained by the acoustic emission test indicates that the first peak reversal of the b-value in time-series can be used to evaluate the concrete sensitivity to disturbance, and the time when the b-value and its first peak appear can characterize the anti-disturbance performance of concrete.