Research on mechanical properties and acoustic emission characteristics of machine-made sand concrete
Based on digital image processing technology,the shape parameters of machine-made sand are determined.Combined with the numerical modeling method,the machine-made sand concrete model with different mesoscopic characteristics was reconstructed,and the mechanics and acoustic emission laws of machine-made sand concrete were quantitatively studied through the discrete element analysis software.The research conclusions are as follows:(1)The machine-made sand concrete with different mesoscopic characteristics under uniaxial compression shows the same stress and strain law,which can be divided into elastic stage,yield stage and softening stage.(2)The higher the roundness of machine-made sand,the greater the peak stress of machine-made sand concrete,and the stronger the plastic bearing capacity,the better the overall mechanical properties.(3)The acoustic emission and energy evolution of the machine-made sand concrete model can be divided into three periods,quiet period,slow increase period and active period.The acoustic emission event zone indicates the propagation path of macroscopic cracks in the sample.The number of acoustic emission events inside the sample dense or high energy release areas are more prone to open cracks.
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