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Effect of concrete specimen size on acoustic emission characteristics under uniaxial compression

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Document pages: 12 pages

Abstract: Acoustic emission (AE) tests under uniaxial compression and cyclic loading unloading compression were carried out on cube concrete specimens with different sizes. The effects of loading mode and concrete size on mechanical parameters and acoustic emission activity of concrete are analyzed. The loading mode has a great influence on the deformation, failure and energy dissipation of concrete materials. With the increase of material size, the uniaxial compressive strength of concrete specimens gradually decreases, while the strain corresponding to the peak strength first increases and then decreases. The elastic modulus fluctuates irregularly. Under uniaxial compression, five acoustic emission modes correspond to the deformation and failure of concretethe concrete materials were observed. A significant nonlinear relationship was found between the AE and the stress level. The cumulative AE rings at the peak stress showed nonlinear growth with the increase of the concrete size. Based on an established relationship between the cumulative AE rings and the stress level, the necessary conditions for the existence of the quiet AE period were given. Under the uniaxial cyclic loading-unloading compression conditions, the Felicity ratio decreased first and then increased as the stress increased. The research results have some guiding significance to AE-based monitoring of internal stress evolution of coal, rock, and concrete materials and thereby enable assessment of their stability.

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